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PDR / The devices we handle / External drives of every size

Devices · the disk that travels in a bag

External drive recovery, Plymouth. There are two machines in this case, and it is very rare that the disk itself is the faulty one.

If you open one up, you will find a hard disk with a small bridge board connecting the hard disk to the USB connector. These bridge boards can be faulty by themselves, and on most models these boards also hold the encryption keys. Taking into consideration how much damage a rucksack may do to a spinning disk on the way across Plymouth, there are potentially two problems here that need to be separated out before starting your recovery.

Nothing readable? Most jobs carry no bill Free diagnosis, then one written price Boxes come to the lab from Truro, Newquay and Tavistock

You will be talking to an engineer
0800 6890668

Most weeks bring one of these. Routine bench work.

Not listed? Try the triage →
Shipping to us: once you receive your quote, pack it securely so it won't move in transit, get it insured for what it is worth, and send it by tracked post to our intake lab in Bristol. We pay the postage back to you. Please contact us before sending if you would like an engineer to check the packing before the box is sealed. More detailed instructions on sending your item to us can be found on our contact page.

The makes that turn up most weeks.

Western DigitalMy Book · Elements · My Passport: those are the WD units we see most often. We handle more of these than any other make.
SeagateBackup Plus · Expansion · One Touch: some use USB bus power, while others require mains power.
LaCieThe d2 and the Rugged. Owned by Seagate, preferred in film and photography, and prone to beeping when a spindle binds.
Toshiba & VerbatimToshiba's Canvio and Verbatim's Store 'n' Go. The internals vary, along with how they fail.

What the messages are telling you.

Not on the list? →
What turns upWhat that points toWhere to start
The hard drive is not accessible, and Windows offers to format it before it will open.A lead was pulled during a write and left the volume RAW, but everything under it remains intactIgnore that prompt
USB device not recognized: Windows does not have an identity for this deviceNothing appears — the bridge or the diskTry one other lead, then leave it
Device Manager identifies it as Unknown USB Device (Device Descriptor Request Failed)Windows is handed no device identity whateverThe bridge has gone — bench job
Data error (cyclic redundancy check): unable to open the hard driveFailing sectors on the disk behind itUnplug it and leave it alone
Disk Management shows RAW, or Not InitializedWindows reports the inability to read the partition table, therefore it suggests erasing the entire contents of the drive.Refuse. Initialising finishes it.
Upon attempting to attach the external drive to each available USB port, Windows reports a faulty USB device.Either the 5V rail within the enclosure has failed or the bridge has failedCircuit boards fail long before platters ever do

What happens to an external drive while it is with us.

Cases in the log →
01

A number on arrival, then the free diagnosis Free

Whatever is delivered is booked in using a unique reference (case number) on the date it arrives at the bench. The engineer will identify the actual fault at no charge. This gives a straightforward answer on what can be recovered from the drive and what cannot, plus one written quotation. There will be no further activity until you have read and accepted the quotation.

Diagnosis at no chargeA single written figureYou owe nothing yet
02

The housing, then the disk

Before addressing anything else, there is one thing we need to know: has the enclosure failed, or has the disk? Many of these devices arrive completely inactive, with LaCie and Iomega two of the worst offenders, and testing reveals that the disk behind the dead board is good.

Housing or disk, establishedThe bridge tested on its own
03

Which part does the encrypting

Nobody switches this capability on; it is always turned on when the drive ships. What we need to figure out is which part does it: the enclosure (housing) or the disk. Most portable drives have their bridges perform that function, so the keys reside on the board and never reach the platters. Once they are lifted off, sectors of data that appeared as noise will once again be organised as folders.

Keys lifted off your own boardOpened, never guessed at
04

Imaged, rebuilt, returned

Before any rebuild process, a hardware imager takes a copy of each sector of your disk. All rebuilding is then performed against this copy rather than your original disk. Any recovered data is placed onto new media and sent back to you, with no cost to you for return postage.

Rebuilt from the cloneYour disk left alone
05

You give the word, and it ships back

Give yourself time to consider it. It costs you nothing. We list all of the files we recover for you before sending out an invoice, and we only ask for payment once you have authorised it. We also buy media specifically for your recovery and send it back to you, with the return postage paid by us. The case stays here on our bench until we have your confirmation that the files open properly on your own machine.

You see the list and decideWritten to fresh mediaWe pay the postage home

The faults we see most

  • Even if no password was ever set on My Passport drives, they still encrypt data, because that encryption function resides within the bridge. Without that bridge, there remains nothing but a disk with no means to access the data, since the key sits on the board it left the factory with. Therefore, the complete unit must arrive intact and undisturbed.
  • Do not select initialisation when Windows advises that a disk cannot be read. If the housing does the encryption, a normal recovery job may become unfinishable due to that single click.
  • Flash memory inside changes nothing: when you remove the mechanical components, firmware, a controller and a bridge are what remain, and each can fail independently. 2023 showed us this on a larger scale. While their failure modes may differ, the exposure does not.
  • The connectors fail before the mechanism does: solder on USB-C or micro-USB connector ports fractures while the disk behind it still has years of life left.

Worth knowing: in 2023 users of SanDisk Extreme portable SSDs (at both 2TB and 4TB) reported having files disappear with no warning whatsoever. This prompted a US class action against Western Digital, and a firmware update issued while it was running settled nothing. If your portable drive is acting strangely, make sure an image of it is taken right now.

A job out of the casebook.

PL · PLY-2026-0788FILED ✓

Just 9 days before the hand-in, the Passport began ticking

The ticking started nine days before the hand-in. A matched donor stack was put into the Passport, and the copy was made at a deliberately slow rate. On the Passport, the encryption keys reside on the bridge board, so that's where they were taken from. All chapters and references came back, with a week left before the deadline.

100% of the thesis72 hours on the bench

Before you seal the box.

Get these done

  • Include the housing, the cable and any power supply, however damaged they are
  • Any change in the sound: take the power off
  • Two similar drives? Mark which is which
  • Post it whole and unscrew nothing

What to avoid

  • Throwing away the emptied housing
  • Agreeing to initialise an unreadable disk
  • Fitting the disk into another caddy
  • Running recovery software across USB at a dying disk

Questions that come up most weeks.

The housing of the unit has broken. Should I remove the disk?

No. Send everything as is, regardless of what condition the outer case is in. On most portable drives the encryption is done by the USB board rather than the disk itself. Thus, even though the disk may arrive in perfect condition without the outer case, it can only give us ciphertext.

Windows asks me to format the drive. Can I allow this?

No. All it means is that Windows does not recognise the file structure on the drive; it is telling you nothing about the content of the drive. If you allow Windows to format the drive, you will wipe out the very file structure that we would need to rebuild from.

It stopped working the week we moved house. Why?

Disks are not treated kindly in removal vans: hours of vibration, a lot of tossing around, and a big change in temperature at the far end. In many cases an already weakened disk will fail to start spinning after arrival. We see this regularly.

The caddy is finished. Is the disk still readable?

Almost always. It doesn't matter much to us what the casing looks like. Three things do: (1) the condition of the hard disk itself; (2) the condition of the disk's own circuit board; (3) whether or not there is enough remaining function in the bridge chip to give up the keys.

A drive that stays switched off gets no worse.

Diagnosis costs nothing. We give you a report listing which files can be read, which cannot, and what is needed to get them off. Do not connect the drive until then.

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