The symptom · it never appears
Three questions, in this order, will tell you which part has failed. Does the BIOS show the drive? Is it listed in Disk Management? Does Explorer open it? The stage where it drops out names the broken component — electronics, firmware, or the volume — and none of those three is where your files live. Drives reach this Reading bench from across Berkshire with the same line attached: the computer will not see it. What that describes is a circuit, not your data. The look is free, a single drive is £300 + VAT, and the figure is in writing before work starts.
An engineer answers, and looking is free
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| What you notice | What is likely wrong | What happens next |
|---|---|---|
| Disk Management calls it Unknown, Not Initialized | The drive responds; what is missing is a valid signature and any usable partition table | Say no to that prompt |
| The prompt ending “…before Logical Disk Manager can access it” | Agree to it and an empty partition map replaces the lot | Refuse it, then unplug |
| No Media in Disk Management | Only the controller answers. The storage behind it cannot be reached, and that is a hardware matter rather than a logical one. | Leave it disconnected |
| No entry in the BIOS at all | Electronics or firmware: a failed board, a protection diode gone short, or service-area code that will not load | A component-level fix |
| A 1TB disk the BIOS lists as 0 bytes | Firmware or translator damage — which is why the reported capacity is nonsense | Needs firmware tools, not software |
| Power goes in and nothing happens | The supply side of the board has failed and the TVS diode has shorted | Almost always recoverable |
A case number goes on your device the day it reaches us, and an engineer then finds the real fault — free, and before anything else happens. You are told plainly what will come back and what will not, with one fixed figure in writing beside it. Nothing chargeable starts until you have read that and said yes.
Nothing gets dismantled and nothing is left running. A moment in the BIOS, a glance at Disk Management, a look in Explorer, and the job comes down to one of three things: repairing electronics, rebuilding a service area, or mending a file system on the copy.
A shorted TVS diode is desoldered and a fresh one fitted. If the board itself is beyond saving, a donor stands in — but your own ROM chip transfers across to it, because the adaptive values burned into that chip were measured against your platters and fit no other drive.
As soon as the drive answers, the sector-by-sector copy is taken. All the work that follows happens on that copy, while your drive sits on a shelf, untouched.
You see the file list first, then decide. Nothing is invoiced until you have said yes, and on most jobs there is no fee at all if the data does not come back. What we pull off goes onto media bought in for your job, and the postage home is ours. The case stays open on the bench until you tell us the files open on your own machine.
Worth holding on to: nearly every drive that turns up invisible to its computer has an electronic or a firmware fault. Both of those exist to handle introductions between disk and computer; neither is where your documents sit. A drive that will not appear is reporting on its own hardware and nothing else — which is why this particular fault comes good more often than most, and why the assessment that tells you which it is costs nothing.
The mains failed overnight, and by morning the desktop listed one disk where two had been. The WD sat silent, with no BIOS entry to its name, and the fault was the TVS diode on its board. Its own ROM went onto a donor PCB, and two days after the parcel got here the complete image was off.
Usually, yes. A failed board is repaired or replaced, and whatever stopped it seldom reaches past the electronics into the platters or the NAND sitting behind them. Of everything that arrives here, a drive showing no sign of life at all is among the more predictable jobs.
Never. That box writes a blank partition map straight over the one recording where your files are. Say no, unplug it, and have an engineer see the drive before anything else does.
No. When the BIOS finds nothing, what the disk has lost is its means of introducing itself — not the material written on it. The fault lies either in the electronics or in the firmware kept in the service area, and neither of those places is where your files live.
Very probably. A protection diode takes the spike; it is fitted to short out and fail ahead of everything behind it. So what you have lost is electronics, and what you saved is where it always was.
You pay nothing for the look. What comes back is a list — the files that opened, the ones that did not, and one fixed figure to finish the job. Leave it switched off until you have that in writing.