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HDR / Faults and failures / Drives the computer cannot see

The symptom · it does not appear

Undetected drives, Hull. The computer cannot see it, which says nothing about whether the files are there.

Disks delivered to us from Hull & surrounding areas of the East Riding often have just one line added: "the computer won't see it." That one line refers to a circuit. It doesn't refer to your data. We recommend asking three sequential questions: 1) Is it listed in your BIOS? 2) Is it shown in Disk Management? 3) Can File Explorer access/open it? If it fails at any point in these steps, that tells you what has failed: the electronics, firmware or volume itself.

Only pay if we recover your data, on most jobs Free to look at, then one fixed price Parcels come in from Beverley, Grimsby and Skegness

An engineer will take the details
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Not detected: putting a name to the symptom.

Nothing similar? Go to the triage →
The symptomsWhat the fault isWhat to try
Disk Management shows Unknown, Not InitializedIt shows some life, but it doesn't have a valid disk signature and its partition table is wiped clean.You should click no on the prompt.
The prompt that ends “…before Logical Disk Manager can access it”If you answer yes, the entire partition table for this device will be cleared.You should say no and unplug it.
Disk Management reports No MediaAll that comes back is a response from the controller and absolutely nothing else works. This isn't a logic problem; this is something wrong with the hardware.Just leave it disconnected.
There is no entry for it in the BIOS.It's either the electronics (board) or the firmware. A fried board, a shorted out protection diode, or a service area that won't boot.Repair at component level.
A 1TB drive appears in the BIOS as being only 8MB.Damage to the firmware or translator means the size it shows you when you go to view it is basically useless.Firmware tools are needed to fix this. Not software.
Given power, nothing happensThe TVS diode has failed short (short-circuited); the electronics have been burned.Often possible to get back
Send it to us: get a quote first, either over the telephone or via our online quote form. Then carefully package it to prevent damage in transit, insure it for its full value and post the package using a trackable service to the Leeds intake laboratory; alternatively you may drop it off there (Monday to Friday, 9am to 5:30pm, no appointment needed). For laptops, PCs, Macs and recorders, we require only the drive unit itself (storage soldered to the board is not taken on; if you're not sure which kind you have, ring us first); for RAID arrays and servers, we just need the individual disks, labelled by their respective bays; for a NAS, send the drives if you can remove them, but if not, please include the entire NAS device. A single external drive goes whole, with its cable and power adapter. We pay for return postage. If you would like an engineer to inspect the packaging prior to taping the box closed, please give us a call first. Further information is available on our sending page.

Go stage by stage and the fault gives itself away.

No BIOS entryAt the base of the ladder. An issue like this lower down is an electrical or firmware problem: for example, you've got tracks that are fried, a diode that went short, service area codes the drive could not find. In just about every case, the platters remain unscathed.
In the BIOS, not in Disk ManagementThe unit answered correctly. The damage is higher up, i.e., either the partition table, or the file system's own records. Both of those are fixed on the image.
Missing only from ExplorerEverything below that particular volume is healthy, but that volume itself won't mount. This is file-system level work. Most times it works out okay.
Nothing anywhereOn a spinning disk, this normally points to a surge that caused the TVS diode to go short across the power rails. Just replacing the board won't fix anything. Your hard drive calibration information is located on the ROM chip of the burned board. So, that chip needs to be removed from the broken board, and then put onto the donor board.

From the box arriving to the files going back.

Jobs we have logged →
01

A case number first, then a free diagnosis Free

Every piece of gear that shows up receives a case number on the very same day it arrives. An engineer examines it and determines what is really wrong with it and there is no charge for this. We give you straight language about which files we will be able to copy from the disk and which ones we won't be able to. Then we provide you with a single price quote, in writing, based upon these findings. We don't begin working on anything until you agree to the quoted price.

The diagnosis is freeOne price, put in writingNothing to pay yet
02

Find the stage it fails at

There is no disassembly involved. And also nothing is left spinning. A quick trip through the BIOS. Then a check in Disk Management, and then Explorer. And depending upon what fails, there are 3 areas to be worked on: fix the electronics, rebuild the service area, or restore the file system on a duplicate image.

Checked in orderNothing is written to your disk
03

Repair the electronics

The shorted diode is removed and replaced. If the board cannot be recovered, a donor board takes over and your original ROM chip is moved to it. Because your platter's adaptively acquired values were taken and placed on that ROM chip and they do not exist anywhere else.

Donor board, original ROMShorted diodes replaced
04

Take an image first, work on that

Once the drive responds again, a sector-by-sector image of the entire drive is taken. All subsequent repairs occur only on that image. And your original drive remains untouched in a storage rack.

A full sector copyThe drive itself left alone
05

You sign it off, then it comes back

You will not be charged while you think about this. First, you receive a list of everything that was recovered from the drive. Once you have seen the list and given us the go-ahead, the bill comes next. Files are returned to you on media purchased specifically for this job and we cover the return postage as well. Your job is kept open by us until you can view them on your personal computer.

You approve the listing firstCopied onto new mediaReturn postage at our cost

What turns up most often

  • Every layer of failure typically points to a different component: a disk can fail while in the BIOS, make it into Disk Management but go no farther, or appear in Explorer but still fail to mount even if it makes it past Disk Management. Understanding which one of the three layers it is makes up much of the diagnostic process.
  • The TVS diode is there to blow: it short circuits across the rail to take the spike (which is why a drive that does nothing at all will likely have platters that are okay).
  • The same model number does not equal the same board, because when you replace the original board, you're also replacing the ROM chip that contains the calibration data for those particular platters. So, when a donor board arrives, and it has its own ROM chip, the new board is calibrated for a completely different hard drive.
  • Flash breaks differently: a dead controller or firmware panic can prevent access to healthy NAND; the common WD Blue SA510 that reports 0MB is an example of this. SSDs have their own page.

So what's important here: the overwhelming majority of the drives that reach us without ever being seen by a computer have either an electronics issue or a firmware issue. These issues affect how the drive talks to the computer. However, these issues do not affect how the drive stores your files. If a drive cannot be seen by the computer, then it is telling you about itself. That is it. It is not telling you anything about your files.

One case from the casebook.

HU · HUL-2026-0618LOGGED ✓

The TVS diode went short and the WD stopped dead

Power outage kills one drive. Next day, desktop only shows one drive where two used to be. Dead WD drive would not spin. BIOS did not show any entry for it. Burnt TVS diode killed the drive's board. Its own ROM chip moved onto a donor board. All files recovered within 48 hours after package arrived.

100% copied2 days after it landed

Before you box it up.

Do these first

  • Try another cable and another port, then stop!
  • Can you hear or feel it turning? Tell us!
  • Tell us: was there a power cut? Surge? Lightning?
  • Get a quote first, then post it exactly as it is, unopened

What not to do

  • Clicking yes to the Initialize Disk prompt
  • Fitting a board of the same model and leaving the ROM behind
  • Trying it on every machine in the house
  • Ordering a donor board and soldering it yourself

Asked most weeks, answered here.

The drive shows no sign of life. Can it be recovered?

Typically. Either the circuitry is repaired or replaced, and what destroyed it usually does not make it past the electrical components to the disks/platters or the flash memory. A drive doing absolutely nothing is one of the more predictable failures you will find here.

Windows wants to initialise the disk. Do I let it?

No. Never. This dialogue puts an empty partition table over the file location map. Hit "no", pull the plug from the device, and do not let anyone else get anywhere near it until an engineer sees it.

The BIOS shows nothing. Does that mean it is finished?

No. When the BIOS cannot see the disk, that is because it is losing its ability to announce itself; not because the data within the disk is missing. The failure lies in either the electronic component(s) or the service area code. Neither of these contains your data.

The power went off and it died. Is that why?

Yes. Likely so. A protective diode will take the spike. It was placed for this purpose and to fail (go short) before anything downstream of it could be damaged. You lose some of the electronics. Your data is intact.

What people read after this.

Built-in drives → Solid-state drives → Soaked or burnt → Everything we take in →

A drive left switched off loses nothing more.

Leave it off. There are only a few start attempts left in your failing drive and each attempt uses up a little more of what remains. Our complimentary diagnosis will determine what files are readable.

0800 6890668

Have it looked at How to post it to us