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MHDR / Common faults / A drop or a knock

The fault · shock damage

Dropped a hard drive? Maidenhead. Whether it was spinning decides the rest.

Many of the dropped drives we see come to us from people around Maidenhead. Don't try turning it on first to test if it works. That's probably the last chance your drive will get and you'll waste the attempt. A stationary mechanism can withstand a shock you wouldn't believe when it is turned off. When it spins, its heads float just a few nanometres above the disk, with nowhere in the assembly to give. How the same fall lands is different based on only one factor; this is whether the platters were spinning at the time of impact.

Only pay if we recover your data, on most jobs Diagnosis free, then a fixed quote Get a quote, then post it in from Windsor, Slough or anywhere else

Describe the fault to an engineer
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What a dropped hard drive is telling you.

None of these? Run the triage →
The signsThe likely causeStart here
Has been clicking since the moment it droppedThe drop knocked the heads off track so it keeps trying to find the track againTurn it off forever
Beeping ever since it was droppedThe spindle won't turn. Either the heads have stuck down onto the platter, or the bearings have frozen up.Don't hit it loose
Won't show up on the computer after the dropHeads may be folded, spindle motor may be dead, or board/socket may be brokenWe should take a look at it; you shouldn't run it
Initially good, however now in the process of deterioratingMinor damage that increases progressively in severity with usage timeAct on it while it still has functioning capability
An SSD or memory stick that is non-responsive after a dropNo actual mechanism to damage, so the breakage involves a broken joint, port or circuit boardA repair takes place at the level of the circuit board
If you wish to post it: first obtain a quote for your item via either of two methods: by telephone or by completing the online form. Then you can post the item to us using a tracked and fully insured postal service that will take it directly to our secure intake laboratory in Guildford. Alternatively, if you would rather drop it off at the Guildford laboratory personally, this is possible Monday to Friday, 9am to 5:30pm, and no appointment is needed; either way, we will cover the return postage costs. From a laptop, PC or Mac, send the drive on its own (storage soldered onto the circuit board, as in T2 and Apple silicon Macs or soldered laptop flash memory, is not taken on; if you're unsure which kind you have, please call us first). RAID drives require removal from their casing and labelling by bay number, and server disks will similarly need removing from the server and labelling by bay number. NAS disks need the same procedure if they can be removed; if not, send the entire NAS unit. An external drive must be posted whole, complete with its cable and power supply. If you wish to check the packaging before posting, an engineer will talk you through every item on the telephone. Every stage of this process is detailed on the posting page.

The G figures: a dropped drive at rest and in use.

At rest or in useThe patterns in the datasheets are very predictable: a notebook drive can withstand roughly 300G when in use, whereas it can tolerate about 650G once shut off, meaning the fall impact does not change but the cushion doubles since it's now idle.
Contact with the platterIf a drive is impacted during the time of operation, the read/write heads settle down to the platter surface and bounce upon contact, creating potential scratches on the magnetic surface, which is the only place the files are stored.
Desktop drives are the frail onesCertain 3.5" mechanisms are rated for ~30G in operation, which is nearly what a firm thump on the desk beneath them delivers. Frequently, we hear of the statement made by a user that they barely tapped it, and that is generally true when it comes to a desktop drive.
Flash media that has fallenOne can observe that a WD My Passport SSD or USB stick is not equipped with moving heads or platters, thus can endure the same fall that wrecks a hard drive. Where one does stop working, the fault lies in a fractured joint, a connector or the PCB, all of which can be mended.

What happens between arrival and return.

The most recent cases →
01

Booked in, then assessed at no cost Free

Nothing is chargeable until you say yes. Every item gets a case number of its own immediately upon receipt, an engineer determines what has failed, and you get a clear picture of which files have a real possibility of being recovered. The single quote that follows is fixed, written down and does not cost anything.

Diagnosis at no costOne fixed quote, in writingNothing signed
02

No test power-ups

No device may be used (powered up) by anyone, until an engineer has evaluated its suitability for operation. The very first time that the drive rotates after a fall (drop) is when the bent head contacts the platter. Therefore, if the unit is rotated at all during the evaluation process, it will be rotated just once while being watched.

Inspected before powerOne spin, and it is watched
03

The mechanism put right

Damaged head assemblies are replaced with matching donor units. Locked spindle(s) are released. Stuck heads are gently freed from their 'stuck' positions. Broken PCBs or connectors are repaired.

Matched donor partsBoards and sockets mended
04

Clean sectors first, damage after

All readable data is immediately duplicated as part of the initial recovery process. Once this duplicate is safely stored, the engineer returns to attempt to recover the remaining data that were lost due to the original failure.

Good sectors copied firstImpact damage tackled after
05

Opened, verified, and sent home

You don't get charged anything until you've confirmed and authorised that everything is fine after seeing the entire list of what was recovered. Any recovered items are returned via brand-new storage media and the postage costs for these are covered by us. We do not consider a project complete here until we receive confirmation that you have been able to successfully access and review every item you received back.

You approve the list firstReturned on fresh mediaThe return post is ours

What tends to show up first

  • Is the device idle or in use? A single model number (of a device) corresponds to a single datasheet. However, there are two distinct shock ratings for the same product, hundreds of G apart.
  • Each subsequent restart after a drop further damages the heads. When you start up a failed disk drive each time you cause the damaged head to contact the disk once again. This is why the first startup should occur on a workbench where the head can be monitored for damage.
  • Just because it doesn't make a peep does not mean it is working properly. A slightly bent head can read perfectly fine for a fortnight after the fall, and then suddenly stop reading altogether.
  • Portable devices are designed to be portable; desktop devices are not. 2.5" drives are specifically designed to ride around in bags and on trains, while 3.5" desktop drives were built to sit quietly on shelves.

Manufacturer specifications: A typical 2.5" notebook drive might have a specification rating of ~300G while being used and ~650G while sitting still. Some 3.5" desktop drives are rated as low as ~30G when operating. Turning off your device before lifting it costs you nothing and provides better protection of your data than anything else you could possibly do.

From the casebook, lately.

MH · MHD-2026-6647ON RECORD ✓

A photographer's whole archive, dropped at the venue

It was already clicking at the first test on the bench, having hit a hard floor while a wedding shoot was being packed away. The donor head stack went into the drive (and there were three years of client data sitting on this thing), and every gallery from all shoots, including the morning's wedding shoot, was recovered before the second day of imaging ended.

99% recovered4 days from arrival

Before it comes to the lab.

Do these now

  • If you hear an odd sound: turn it off
  • Place it flat and let it sit there undisturbed
  • Pack up all of the broken parts that fell off and include them with the drive
  • Note whether the drive was turned on at the time

Things best not done

  • Trying again to see if it works 'for good measure'
  • Shaking it until you can find what's causing the rattle
  • Running recovery programs on any damaged hardware
  • Assuming complete silence means the drive is working just fine; get someone to inspect it

The questions that arise most often.

Is a drive still readable after a fall?

Usually, unless someone has done something else first; recovering files from a drive is nearly always worth the money, while repairing a mechanical failure in the drive rarely is, and a donor head stack with slow, careful imaging gets most of a fallen drive back.

It went over while it was switched on. How serious?

Bad: It is the worse of the two. When the shock lands while heads are flying they can scratch the platter. A running system can take a fraction of that which a parked system would absorb. Shut down immediately.

Does a dropped SSD lose its data?

Almost never. No internal components are moving upon impact, therefore a failure shows itself as a split circuit board, a broken connector or a dry solder joint. These are electrical issues and the NAND holding your files is generally unharmed.

It kept working for a week after the drop, then failed. Linked?

Yes, almost always. Slight damage to a head and/or bearing increases each time the unit spins up; thus the shock caused immediate damage and each subsequent startup simply sped this process along.

Switched off, it keeps every chance it has.

Every additional power-up asks for even more of a drive that is already starting to fail. First open a case with us, and let the free diagnosis tell you how much remains.

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