Rescuing data after a hard drive crash. Data recovery (external hard drive dropped)

How realistic is it to recover data from a “fallen” hard drive? Quite often we are approached with exactly this question. We are talking about drives from a variety of manufacturers: WD, Toshiba, Seagate, Samsung and others. If an external HDD drive, or an internal (system) drive together with a computer, often a laptop, has fallen from a height onto the floor, then we are often talking about recovering data from a hard drive with mechanical damage. Sometimes they say “the disk has fallen,” meaning that it is impossible to read data from the HDD. It worked and worked, and suddenly it “fell”: it is not detected by the system or the BIOS shows the disk capacity as 0 bytes. In computer jargon - "fell into a fly CC." Thus, there are possible options for disk “fall” (failure) – hardware or software (logical). The main question in this case is how to “pull out” information, for example, a family photo archive for several years or business documents. In the first case, if you lose files, you will learn a lot from your relatives about your computer abilities. But in the second case, in the absence of timely archiving of information, the matter may not be limited to emotions, the cost of the issue may turn out to be extreme! So what to do, and most importantly, what not to do if you really want to save (not lose) information.
Let's look at the options for a hard drive failure:

  • The disk or the computer with the disk fell while it was on. In this case, there is a very high probability that a scratch will form on the magnetic disks. Its size depends on how long the damaged HDD was turned on. Any scratch, even the smallest one, reduces the likelihood of data recovery . Conclusion: Never turn on your computer (do not use an external drive) after it has fallen! Turn it on - there will be a lot of scratches, and restoring the information will either be difficult and expensive, or it will be lost altogether.
  • If the disk is dropped or hit while it is turned off, the head unit may not be damaged, but simply stick to the surface of the disk. The quality of the pancake surface is so high that the read head can stick to the disk by molecular attraction. To prevent this from happening, the BMG is parked in a special zone when turned off. However, upon impact, the head assembly may jump out of the parking area and stick to the surface of the disc. Conclusion: If the disk (or computer) is dropped while it is turned off, do not try to turn it on. The result will be the same as in the first case! Scratches. Lots of scratches. The photo clearly shows what happens to the surface of the disk if the HDD is repeatedly turned on after a fall. Also, the heads may come off, the shaft may jam, and other mechanical damage may occur. Experience shows that many troubles can be avoided, partially or completely, if do not turn on a dropped disk.
  • The disk did not fall from a height, but the microprogram that controls the hard disk was destroyed. Mechanically, the HDD is functional, but it is impossible to read information from it in the usual way. The reasons are very different. The most common of them are the so-called (otherwise known as “Mukha SS”) and LBA 0. The hard drive is one of the most complex components of a computer. In principle, it is itself a computer with its own processor, memory and something like an operating system, stored in an area inaccessible to the user. When started, the HDD, like a personal computer, loads its operating system, checks operating parameters and then opens access to user data. Those disks that the BIOS no longer sees cannot simply be flashed; special equipment is required. Working with a disk in terminal mode requires caution, certain knowledge, and an understanding of what you are doing. Even one single error in the command can lead to complete inoperability of the drive. The disk, perhaps, will come to life later, under a successful combination of circumstances, but you will lose the opportunity to extract information from it forever. Conclusion: Do not under any circumstances try to take actions on your own, such as rearranging boards from another hard drive, using surrogate, “homemade” terminals to gain access to the service information of the hard drive, etc. In the vast majority of cases, you will not be happy with the result: you will lose the data irretrievably.

Discs with damaged surface.

Algorithm for recovering data from a “fallen” hard drive

  1. Contact the service center immediately. The first commandment is absolutely not to take any other actions! The second commandment is not to try to write new information to the media from which you want to recover data.
  2. Service center "Kvatron", having the necessary equipment, qualified specialists and a special room, carries out a range of data recovery works.


So, if trouble happens, and this, alas, is not uncommon, do not rush to despair - in most cases, data recovery is quite possible.

Recovery begins with a set of measures aimed at bringing the hard drive to working condition. All work related to opening the HDA of a hard drive is carried out in a laminar flow hood. After replacing faulty components and testing the performance of the disk, a sector-by-sector copy is read at the stand and reading errors are corrected. This is the only way to completely restore the information. Modern equipment and the PC-3000 hardware and software complex for hard drive recovery provide a successful solution to problems of any level of complexity. Of course, if it is necessary to wedge the shaft, transfer the pancakes to another hermetic unit, or replace the heads, then this will not be cheap. But in the case of very valuable data, “the game is worth the candle.”

Want to save money? There are a lot of offers on the Internet. For example, take a Phillips screwdriver, a cable from a mobile phone, and a couple more wires. Poke here and there and try to read service information from the hard drive on such a “terminal”. Compare the cost of such a “gentleman’s” set with the cost of a real PC-3000 complex (about 40 thousand rubles), and you will understand the difference in the expected results. Sometimes, however, they write that all problems can be easily fixed with a little patience and perseverance. But at the same time, they forget to tell you that not only is there no guarantee of success, but also, if something goes wrong, the disk, and all the data on it, will be lost forever. The same can be said about rearranging controllers, as a result of which it’s easy to get two instead of one ruined disk. Well, the advice to open the hermetic block in a normal (non-laminar) room does not need any comments at all.

Undoubtedly, it is best to immediately contact specialists without wasting time. The cost of services from the Kvatron Service Center will suit you perfectly thanks to a balanced pricing policy. In advance, for consultation, you can call us or request a call back. Come, we are easy to find. If necessary, our

Yes...It happened, your hard drive fell on the floor and doesn’t want to work anymore, but there is still so much information we need and need on it, and we are faced with a difficult task: How to repair a hard drive after a fall, restore all the data and forget this incident like a bad dream. This problem is completely solvable and we will certainly solve it together with you.

How to repair a hard drive after a fall?

The main thing is not to panic!

So, at the very beginning, we are trying to understand how hard our hard drive was hit, and what type of damage it has and how it behaves after the fall.

Well, let's start diagnosing possible problems:

  1. Scratches, dents and other mechanical damage. Our hard drive, with a light hand, foot, or someone's furry paw, fell to the floor with a crash and received mechanical damage; in this situation, the hard drive experiences violations of the geometric parameters of the HDA and the internal parts of the hard drive. Even a normal small displacement is enough to prevent the heads from catching the track or damaging the magnetic surface.
  2. The pancakes don't want to unscrew. This situation occurs when some kind of obstacle forms, something gets stuck in the engine, right in the middle of the seal. It happens that the heads can stick to the magnetic surface of the disk, so the pancakes do not unscrew.
  3. The heads click, knocking and clicking noises are heard. This tells us that the heads cannot detect servo information because the disk hit and, as a result, the magnetic disks shifted. In case of such a breakdown, spare parts are needed, namely, we are talking about replacing an entire block of magnetic heads.
  4. Extraneous mechanical noises (squeaking and grinding) are heard. When a hard drive is dropped, we can often hear the disks spinning noisily, which indicates that the disks are scratching the magnetic surface of the hard drive as they rotate. In such a combination of circumstances, the data cannot be restored. But still, a very important aspect is that the disk was turned off when it fell, if so, then under no circumstances should you turn it on, but you should take it to the nearest repair shop and then everything will be fine.
  5. The disk does not spin up. But at the same time strange sounds are heard, either a squeak or a whistle. This indicates to us that the heads are stuck to the magnetic surface. The disk tries to spin, makes jerks, but nothing happens. How can a problem cause this? The block of magnetic heads is severely damaged, the plates have shifted and are not relative to each other (in new models we can often see as many as four plates), the motor bearing is jammed and the hard drive refuses to spin, the surface of the disks has mechanical defects.

Problems associated with hard drive crashes and their percentage

Problems of a physical nature: various damage to magnetic heads, plates, motor wedge. And physical damage accounts for 59% of hard drive failures after a fall.

Problems of a logical nature: As a rule, this is an infection of the hard drive data, which occurred after malware got there. A virus can significantly damage data or completely erase it. Software problems account for 33%.

Software problems. This type of problem is a consequence of “glitches” or serious problems with the internal hdd system. Software problems account for only 8% of all the above problems. Let's focus on the most common problems: breakdown of the magnetic head unit and motor bearing wedge. If a magnetic block breaks down, we cannot do without a similar spare part, that is, this very block. The magnetic heads will have to be replaced; this will require special equipment and appropriate skill. If the disk jams, the disk package must be replaced, which also requires the necessary equipment and special skill.

Replacing the heads of the magnetic block

This type of repair is started if the heads break or the switch preamplifier is damaged. To fix such a problem, we need an identical part, namely a working HDA with the required number of plates and heads, respectively. In some cases, replacing a unit must be approached with special responsibility, since in some models we can observe such a picture as a combination of several types of switches.
When repairing a hard drive, first of all, you need to remove the magnetic head unit, then unscrew the bolts that secure the magnetic plate and contacts. This must be done carefully, without overdoing it, by picking up tweezers and grasping the plate, thus separating it from the hermetic layer and the hermetic block itself. The most important thing is not to damage the cable connecting the HDA to the contact group. Then we unscrew the bolts, and before our eyes such a component of the hard drive appears as an external magnet; there may be problems with its removal, since if it is removed carelessly, the magnet can “jump out”, which can lead to unpleasant consequences. The magnets installed on hard drives are very powerful and their removal requires a special approach, so we arm ourselves with wire cutters or small pliers and, resting on the base of the hard drive, use the tool as a lever, thus removing it smoothly; the same pattern must be followed when reinstalling the magnet . When removing the magnet, it is very important not to damage the heads so that they do not move anywhere from the parking area.
After the magnet is removed, we can observe what is underneath it, namely: the axis of the magnetic head unit, the coil and the bearing. Then unscrew the central bolt and carefully pull the structure out of the sealed block. After this, the heads must be carefully inspected for scratches and other defects. If any defects are found, then the heads must be replaced urgently.
So, we remove the block from the latch and in its place we put a “healthy part” purchased somewhere in advance or removed from another “experimental hard drive.” New heads are carefully placed in the parking area of ​​the hard drive being repaired. The retainer forks also need to be removed from under the block of magnetic heads, after which, when gently held, the heads lie on the parking strip. After the heads are neatly placed, we turn the lock and remove it, thereby moving its levers outside the plates. We tighten the main screw that holds the axis of the magnetic head unit inside the sealed unit. We put the top magnet and magnetic circuit in place, just as carefully as we removed it, secure it well with screws, and then screw the cover on.

Replacing the magnetic disk package

This procedure is quite complex and scrupulous and therefore it is better to entrust it to the service center specialists. But if you are confident in your abilities, then we will need exactly the same donor, and we will reinstall the entire package of plates. When replacing, it is impossible to allow interaxial displacement of each plate; if at least one plate shifts, then it will be impossible to read the information. It would seem nothing complicated, but the work is practically jewelry.

What to do if the spindle is jammed...?

The spindle wedge can occur in different scenarios; we will be most lucky if its upper surface or the heel of the shaft itself begins to jam. In this case, you won’t have to spend a lot of work, you just need to remove the lock washer, which serves as the base of the bearing cup; you don’t even have to open the sealed block, but simply release the stuck shaft.

When working with a hermetic block, it is very important to evaluate your strengths and capabilities, since such a seemingly small mechanism, but it works quite difficult, so you need to carefully select the tool and keep the workplace clean, even avoiding dust. After all, even the slightest grain of sand can throw the entire repair process down the drain. Thermoblock is a delicate matter, this is probably what professionals who have devoted many years to this matter say.

Well...I sincerely believe that I managed to describe in Russian how to repair a hard drive after a fall, and I wish you, or rather your hard drive, not to fall and work flawlessly.

Over the years, we at Storelab Data Recovery have collected a small collection of myths about data loss and recovery. Some of them are actively replicated on various computer and non-computer forums - so we hope this article will be useful to those who are looking for help when a disk breaks or data is lost. So, a post about how not to make a difficult situation even worse.

The photo shows the result of “cooling” the hard drive

1. Shock-resistant enclosures for external drives

This is a marketing ploy - rubberized cases do not protect the hard drive from damage after a fall, for example. They, of course, look beautiful and impressive, and give the hard drive itself an appearance of reliability that instills confidence in the buyer - that’s why they buy them. However, they very slightly reduce the overload on the disk parts during an impact or fall. This can save if the height is small (up to about 50 cm for 2.5-inch hard drives, up to 20 cm for 3.5-inch drives) and for the drive when it is turned off. When turned on, the disk will almost always break, because... the maximum permissible overload on a working disk is 5-7 times less than on a disabled one. We crash tested two-terabyte drives from Samsung, Hitachi, WD, and Seagate. They dropped it on, starting from a height of 5 cm, then ten, then every 10 cm. All drives, except Samsung, were broken after 15 cm. “Samsung” broke at 40 cm due to rubber dampers standing between the hard drive itself and the case. All drives were external 3.5-inch.

2. If the hard drive is acting up, tap it while booting, for example, with a screwdriver

To achieve this effect, you can also lightly tap the disc on the floor. But it won’t be a “repair effect.” As a result of such dancing with a tambourine, small particles of what breaks off inside will scratch the disk, and the data will no longer be recoverable. Data can be destroyed especially efficiently if you turn on the disk and then drop it from a height of about a meter (see the previous paragraph). Beautiful cuts form on its surface, after which it will be impossible to restore the data.

3. There is a vacuum inside the hard drive

- or, as some of our clients say, “inert gas”. Therefore, if you accidentally open the hard drive, you will be sucked into it due to the fact that the air from the room is “sucked” into the vacuum space of the hard drive. It’s a good myth, it’s a pity to dispel it: maybe this way we can dissuade some “craftsmen” from making their data “irrecoverable” by disassembling the disk? However, in fact, inside the disk there is just clean, dust-free air so that nothing gets into the space between the disk and the head.

About 10-15 years ago, disks were actually made completely sealed; you could even fill them with water, drown them, then wipe the electronics board and continue using them - no water got inside. On modern disks there are always holes in the HDA core or cover with the inscription “DO NOT COVER THIS HOLE”; under them there are air filters that trap unwanted particles. This change was made by manufacturers due to the introduction of new production technologies, cheaper production costs and a number of other reasons. If such a disk is dipped into water, it will enter the hermetic unit through the filter.

4. A “clean room” can be provided at home and the disk can be disassembled

For example, you can disassemble and reassemble the disk in the bathroom if you wash it clean first. This is one of our favorite misconceptions. Even an experienced specialist is unlikely to cope without a comfortable table, chair, necessary tripods, tweezers, screwdrivers and pullers. And the user will not organize a full-fledged workplace at home in the bathroom with all the necessary tools, at least for economic reasons, because... Usually they try to repair disks themselves just to save money. As we already said in the previous post, the disk is assembled and disassembled in a special dust-free space, and the specialist working with the disk is dressed in special clothing. Although, if you wash the bath properly... No, we still do not recommend doing this.

5. If the BIOS or axis does not see your hard drive, it means it is broken and needs to be disassembled

In fact, if it is not possible to come to an agreement with the disk in the software language, specially trained hardware is used, which establishes a “dialogue” with the problem disk. At this level, you can clean bads, replace broken software on the disk itself, you can “remove” information from bads and transfer them to another medium, etc.

You only need to disassemble the disk when it is physically defective.

6. The hard drive needs to be heated/cooled to work better

The hard drive has a servo drive, which allows you to more precisely adjust the position of the head in relation to the disk, and there is a surface layer of the disk. A certain gap must be maintained between the head and the disk. But sometimes the head starts to malfunction. Little knowledge is worse than ignorance: someone figured out that as a result of the natural heating of the disk and all sorts of things about the expansion and contraction of materials, this is treated by cooling/heating. As a result of the “freezing” of the hard drive, condensation forms between its plates. The first time you turn it on after such cooling, the disk may be permanently damaged. The photo at the beginning of the post is an example of what the disk turns into when you turn it on after an hour in the freezer.

7. Data is recovered using a special “data recovery machine”

The origins of this myth are in human imagination. Allegedly, the faulty hard drive is pushed into some kind of machine, which seems to be acted upon by magnets, and the data that “was lying around in disarray on the disk and therefore could not be read” is again lined up in even “rows.” In fact, they use either software, or special devices, or a “clean room” (read, disassembling the disk). Data on a physically faulty disk is not restored back - a donor is used for this.

8. Data recovery specialists are not needed because there are free utilities

Utilities will not help if the disk is physically damaged. You need to restore it at least to a “healthy” partition, or better yet, to a new medium.

9. The disk can be repaired

You can change its program, and then find and hide the bad things. But this will not fix the disk. The data needs to be restored to a new disk. That is why when you turn to data recovery specialists, a “donor” is used - a working device to which the data is restored. If someone promises to repair a dead disk, he most likely does what is described in this paragraph: but this does not make the disk either new or “repaired” and working with it in the future is not safe for the safety of your data. If his hour has struck, then it has struck.

10. You can take a pancake from a broken disk, take a working disk, remove the pancake from there, put a pancake with data there, and count everything

For this to work, you will have to guess with the disc's own program, the disc series - well, in general, take the same exact disc and put a pancake from the same exact disc on it. However, this does not negate the need to work in a specially prepared room and the availability of equipment (see paragraph 4 about the “clean room”).

11. Professional data recovery is expensive, prices start at 25,000 rubles

Some companies would like you to believe this myth. In fact, the price consists of various factors. How difficult it is to recover data will depend on what you did with the drive after it failed. Turn off the computer (so that it is not tempted to “fix” the disk itself), do not use utilities, do not disassemble the disk - and perhaps the data can be recovered without resorting to a “clean room” - and this is the most expensive option. When the hard drive is physically intact, the cost of data recovery should be around 1,500 rubles. Diagnostics should be carried out free of charge, and if, for some reason, the data could not be recovered, you should not pay anything.

12. Solid state drives are indestructible

A solid-state drive has no moving parts, like a hard drive, and there is nothing special to spin or break in it. However, this does not mean that they can play football - they are not insured against collapse. In an effort to make them smaller in size and larger in volume, manufacturers sometimes forget to make them also reliable. In addition, these drives are protected from ordinary falls or drowning in the same way as any hard drive: only by your own prudence and luck. In addition, they are more expensive and have a limited number of rewrite cycles. In addition, SSD drives released before 2009 were often slower than HDDs, especially after long-term use.

13. If the manufacturer claims that the disk can work for 500,000 hours, then it will last for the next 57 years and will not break down

4% of such drives break in the first year. The fact is that the time stated on the packaging is the estimated time of how long a disk of this model should theoretically work. And it doesn’t say a word that your drive will work that long.

14. The more you pay, the better your data will be recovered, so you need to choose the most expensive recovery

Data cannot be restored “better” or “worse”. They may or may not be restored. For this purpose, special software, special devices and, finally, tools and a “clean room” are used. Data recovery devices are expensive in their own right, but do not vary enough to greatly affect the price difference for data recovery services. It's all PR and marketing.

15. Data can be recovered after a complete overwrite using residual magnetization

This myth comes from the past, when computers were large and hard drives were small. On hard drives with a capacity of up to 1 MB, recording was done byte-by-byte, that is, simply put, one disk cluster when written was equal to one byte. In this case, it made sense to look for residual magnetization and restore data on it. Now, when data is recorded sector by sector, and one sector contains 512 bytes, and the recording density is tens of gigabytes per square centimeter, this is no longer possible.

The phrase “hard drive has fallen” has two meanings in computer geek slang. In one case, this refers to the restoration of functions, as well as data that are in the hard drive, when it actually fell from a certain height and the consequences of this fall are mechanical damage.

And in the second case - when it is meant that it is impossible to remove data from the disk, due to the computer system not perceiving it (the computer “does not see” the disk) or when the disk’s own operating system shows its capacity as zero.

How to recover a hard drive after a shock?

Therefore, the consequences of an actual or conditional “fall” of the hard drive may include:

— hardware nature (mechanical damage), which accounts for 59% of all hard drive failures;

— logical nature (when the disk is infected with a virus), which accounts for 33% of malfunctions;

— software problems (due to a program failure) account for 8% of the possible causes of a hard drive crash.

Consequences of mechanical damage resulting from an impact or falling hard drive

The situation is this: there is a hard drive that has been dropped or received a blow. The task is how to restore a hard drive after a fall, which means restoring the information that is on the disk after the damaged hard drive has been repaired.

As a rule, in order to overcome problems resulting from damage to a disk drive, it is necessary to eliminate violations in its mechanics. The consequences of these violations may be:

— chips of the body and dents from impact. When an external drive or an internal hard drive located in the system unit falls, the integrity and displacement of its mechanical parts occur and minimal displacements are sufficient for the disk heads to touch its surface;

— the inability of magnetic disks to spin up to the required speed. Which may be a consequence of the motor jamming or the reading heads sticking to the magnetized surfaces of the disks, thereby preventing their normal rotation;

- knocking of the read heads. Which means the heads can't read the data because the disks have become misaligned. With this type of damage, it is necessary to change the entire block of magnetic heads using a purchased donor. Where the donor is a block of magnetic heads completely identical to the damaged block;

- noise when rotating disks. This is evidence that the heads are touching the surface of the disks, scratching it. In this case, the data on the disk most likely cannot be saved.

— the disk cannot spin up, but sounds are heard from the hard drive case. This may indicate that the heads are stuck to the magnetic disks. The motor cannot overcome the resistance of the stuck read heads.

Therefore, if an external storage drive or a computer operating unit with a hard drive inside is dropped without being turned on, under no circumstances should you turn it on afterwards to check its operation. You must immediately contact a service center in order to carry out a restoration, as disk and the information stored on it;

We tell you how to do this in Russian and in as much detail as possible. However, when deciding how to restore a hard drive after an impact, when replacing damaged magnetic read heads, it is necessary to take into account their full compatibility.

Replacement must be done in a perfectly clean workplace and using perfectly clean working tools. Otherwise, dust particles trapped in the sealed casing of the disk drive can ruin all the work of replacing the magnetic head unit. Since dust can scratch the magnetic surface of disks, thereby destroying the information stored on them.

When selecting a donor to repair a hard drive to replace a block of magnetic heads, you also need to take into account that the heads match in user zones or, as computer scientists also call them, parking types, which are divided into internal (when the heads are between the disks) and external (when the head is located outside drive) parking.

After a donor hard drive with heads has been selected and all other parameters of the hard drive are completely identical, you can begin the process of disassembling the damaged drive. The screws that are located on the cover of the hard drive housing that secure the axis of the magnetic head unit are unscrewed from the very beginning. After this, unscrew the screws that connect the cover to the main body of the hard drive. The cover is removed with extreme care so as not to damage the seal.

Only after removing the cover will there be access to the engine and the head positioning system, the magnet of which must be removed to get to the heads. After removing the magnet, having first unscrewed the screws securing it, you should disconnect the head control connector, which is attached to the hard drive case. Only after this they begin to remove the parking system with limiters that limit the free exit of the heads from the user area.

If the design of the hard drive is such that it has only an external parking system, then the heads are brought out beyond the user zones, while moving them beyond the magnetic disks, carefully so as not to damage the surface, rotating them until the heads go beyond the user zones.

At the same time, to prevent the heads from sticking together, you need to insert strips of insulating material between them. This, of course, is the case if the hard drive has more than one read head.

After the heads are moved beyond the disk, unscrew the screw or nut securing the magnetic head block and remove them from the axis. This operation should be carried out with rubber gloves to isolate the heads from static electricity, which can accumulate on unprotected skin of the hands. In addition, the block of magnetic heads must be removed using tweezers so as not to damage the conductors connecting the heads to the switching device.

After removing the heads of the damaged hard drive, we perform the same operations with the donor hard drive, removing the heads in the same way.

Installation of the heads is carried out in the reverse order of their removal, starting with installing the donor heads on the axis of the damaged hard drive using, again, tweezers, and securing them with a screw after they are placed above the surface of the magnetic disks.

They are installed by rotating the magnetic disks and moving the heads into the parking area. We can say that it was carried out successfully only when, when rotating the disks, no extraneous sounds are heard or the disks are not felt jamming. Otherwise, you need to once again carefully check that the magnetic heads of the disks are installed correctly.

Otherwise, if the heads touch the surface of the disks, this may damage them, with the loss of all data accumulated on the disks.

If the heads are successfully inserted into the user zones, we install all other elements of the head positioning system in place - we put the positioning magnet in place, connect the terminals, screw in all the fasteners and turn on the hard drive.

Repairing a damaged disk is only necessary to recover data

If installed correctly, the hard drive should be visible to the computer, and we can copy all data from it. However, it is still not recommended to use this disk in the future. Before you repair a hard drive after a fall, you need to clearly understand that repairing this drive is necessary in order to remove the necessary information from it. And nothing more. Even a repaired disk will no longer work reliably after a fall. Therefore, such disks are repaired only to remove important data.

Having familiarized yourself with the hard drive repair procedure, you can determine that these operations still require professional skills and abilities. Therefore, if you need to recover data from a damaged hard drive, it is best to contact special service companies that have the appropriate conditions, tools, software for reading information from damaged drives and, of course, qualified specialists.

Over the years, we at Storelab Data Recovery have collected a small collection of myths about data loss and recovery. Some of them are actively replicated on various computer and non-computer forums - so we hope this article will be useful to those who are looking for help when a disk breaks or data is lost. So, a post about how not to make a difficult situation even worse.

The photo shows the result of “cooling” the hard drive

1. Shock-resistant enclosures for external drives

This is a marketing ploy - rubberized cases do not protect the hard drive from damage after a fall, for example. They, of course, look beautiful and impressive, and give the hard drive itself an appearance of reliability that instills confidence in the buyer - that’s why they buy them. However, they very slightly reduce the overload on the disk parts during an impact or fall. This can save if the height is small (up to about 50 cm for 2.5-inch hard drives, up to 20 cm for 3.5-inch drives) and for the drive when it is turned off. When turned on, the disk will almost always break, because... the maximum permissible overload on a working disk is 5-7 times less than on a disabled one. We crash tested two-terabyte drives from Samsung, Hitachi, WD, and Seagate. They dropped it on, starting from a height of 5 cm, then ten, then every 10 cm. All drives, except Samsung, were broken after 15 cm. “Samsung” broke at 40 cm due to rubber dampers standing between the hard drive itself and the case. All drives were external 3.5-inch.

2. If the hard drive is acting up, tap it while booting, for example, with a screwdriver

To achieve this effect, you can also lightly tap the disc on the floor. But it won’t be a “repair effect.” As a result of such dancing with a tambourine, small particles of what breaks off inside will scratch the disk, and the data will no longer be recoverable. Data can be destroyed especially efficiently if you turn on the disk and then drop it from a height of about a meter (see the previous paragraph). Beautiful cuts form on its surface, after which it will be impossible to restore the data.

3. There is a vacuum inside the hard drive

- or, as some of our clients say, “inert gas”. Therefore, if you accidentally open the hard drive, you will be sucked into it due to the fact that the air from the room is “sucked” into the vacuum space of the hard drive. It’s a good myth, it’s a pity to dispel it: maybe this way we can dissuade some “craftsmen” from making their data “irrecoverable” by disassembling the disk? However, in fact, inside the disk there is just clean, dust-free air so that nothing gets into the space between the disk and the head.

About 10-15 years ago, disks were actually made completely sealed; you could even fill them with water, drown them, then wipe the electronics board and continue using them - no water got inside. On modern disks there are always holes in the HDA core or cover with the inscription “DO NOT COVER THIS HOLE”; under them there are air filters that trap unwanted particles. This change was made by manufacturers due to the introduction of new production technologies, cheaper production costs and a number of other reasons. If such a disk is dipped into water, it will enter the hermetic unit through the filter.

4. A “clean room” can be provided at home and the disk can be disassembled

For example, you can disassemble and reassemble the disk in the bathroom if you wash it clean first. This is one of our favorite misconceptions. Even an experienced specialist is unlikely to cope without a comfortable table, chair, necessary tripods, tweezers, screwdrivers and pullers. And the user will not organize a full-fledged workplace at home in the bathroom with all the necessary tools, at least for economic reasons, because... Usually they try to repair disks themselves just to save money. As we have already said in, the disk is assembled and disassembled in a special dust-free space, and the specialist working with the disk is dressed in special clothing. Although, if you wash the bath properly... No, we still do not recommend doing this.

5. If the BIOS or axis does not see your hard drive, it means it is broken and needs to be disassembled

In fact, if it is not possible to come to an agreement with the disk in the software language, specially trained hardware is used, which establishes a “dialogue” with the problem disk. At this level, you can clean bads, replace broken software on the disk itself, you can “remove” information from bads and transfer them to another medium, etc.

You only need to disassemble the disk when it is physically defective.

6. The hard drive needs to be heated/cooled to work better

The hard drive has a servo drive, which allows you to more precisely adjust the position of the head in relation to the disk, and there is a surface layer of the disk. A certain gap must be maintained between the head and the disk. But sometimes the head starts to malfunction. Little knowledge is worse than ignorance: someone figured out that as a result of the natural heating of the disk and all sorts of things about the expansion and contraction of materials, this is treated by cooling/heating. As a result of the “freezing” of the hard drive, condensation forms between its plates. The first time you turn it on after such cooling, the disk may be permanently damaged. The photo at the beginning of the post is an example of what the disk turns into when you turn it on after an hour in the freezer.

7. Data is recovered using a special “data recovery machine”

The origins of this myth are in human imagination. Allegedly, the faulty hard drive is pushed into some kind of machine, which seems to be acted upon by magnets, and the data that “was lying around in disarray on the disk and therefore could not be read” is again lined up in even “rows.” In fact, they use either software, or special devices, or a “clean room” (read, disassembling the disk). Data on a physically faulty disk is not restored back - a donor is used for this.

8. Data recovery specialists are not needed because there are free utilities

Utilities will not help if the disk is physically damaged. You need to restore it at least to a “healthy” partition, or better yet, to a new medium.

9. The disk can be repaired

You can change its program, and then find and hide the bad things. But this will not fix the disk. The data needs to be restored to a new disk. That is why when you turn to data recovery specialists, a “donor” is used - a working device to which the data is restored. If someone promises to repair a dead disk, he most likely does what is described in this paragraph: but this does not make the disk either new or “repaired” and working with it in the future is not safe for the safety of your data. If his hour has struck, then it has struck.

10. You can take a pancake from a broken disk, take a working disk, remove the pancake from there, put a pancake with data there, and count everything

For this to work, you will have to guess with the disc's own program, the disc series - well, in general, take the same exact disc and put a pancake from the same exact disc on it. However, this does not negate the need to work in a specially prepared room and the availability of equipment (see paragraph 4 about the “clean room”).

11. Professional data recovery is expensive, prices start at 25,000 rubles

Some companies would like you to believe this myth. In fact, the price consists of various factors. How difficult it is to recover data will depend on what you did with the drive after it failed. Turn off the computer (so that it is not tempted to “fix” the disk itself), do not use utilities, do not disassemble the disk - and perhaps the data can be recovered without resorting to a “clean room” - and this is the most expensive option. When the hard drive is physically intact, the cost of data recovery should be around 1,500 rubles. Diagnostics should be carried out free of charge, and if, for some reason, the data could not be recovered, you should not pay anything.

12. Solid state drives are indestructible

A solid-state drive has no moving parts, like a hard drive, and there is nothing special to spin or break in it. However, this does not mean that they can play football - they are not insured against collapse. In an effort to make them smaller in size and larger in volume, manufacturers sometimes forget to make them also reliable. In addition, these drives are protected from ordinary falls or drowning in the same way as any hard drive: only by your own prudence and luck. In addition, they are more expensive and have a limited number of rewrite cycles. In addition, SSD drives released before 2009 were often slower than HDDs, especially after long-term use.

13. If the manufacturer claims that the disk can work for 500,000 hours, then it will last for the next 57 years and will not break down

4% of such drives break in the first year. The fact is that the time stated on the packaging is the estimated time of how long a disk of this model should theoretically work. And it doesn’t say a word that your drive will work that long.

14. The more you pay, the better your data will be recovered, so you need to choose the most expensive recovery

Data cannot be restored “better” or “worse”. They may or may not be restored. For this purpose, special software, special devices and, finally, tools and a “clean room” are used. Data recovery devices are expensive in their own right, but do not vary enough to greatly affect the price difference for data recovery services. It's all PR and marketing.

15. Data can be recovered after a complete overwrite using residual magnetization

This myth comes from the past, when computers were large and hard drives were small. On hard drives with a capacity of up to 1 MB, recording was done byte-by-byte, that is, simply put, one disk cluster when written was equal to one byte. In this case, it made sense to look for residual magnetization and restore data on it. Now, when data is recorded sector by sector, and one sector contains 512 bytes, and the recording density is tens of gigabytes per square centimeter, this is no longer possible.