The symptom · nothing appears at all
Disks reach us from every part of Cardiff with the same line attached: the computer cannot see them any more. That sentence describes a circuit, not the contents. Put three questions in order — is it in the BIOS, is it in Disk Management, is it in File Explorer — and whichever one it fails names the broken piece: board, firmware or file system.
Describe the symptoms to an engineer
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| Warning signs | What has gone wrong | Do this now |
|---|---|---|
| Unknown, Not Initialized in Disk Management | The disk answers, but carries no readable signature and no partition table | Turn the prompt down |
| The message ending “…before Logical Disk Manager can access it” | Agree to it and an empty partition map is written over the lot | Click no, then unplug it |
| No Media reported in Disk Management | Only the controller is responding; nothing can get to the storage behind it, which makes this hardware rather than logic | Stop plugging it in |
| Nothing listed in the BIOS | Electronics or firmware — a scorched board, a shorted protection diode, a service area that no longer loads | Repair at component level |
| A 1TB disk reported as 8MB in the BIOS | The firmware or the translator is damaged, so the capacity it reports means nothing | Firmware tools are needed, not software |
| Powered up, it does not react | Burnt-out electronics; the TVS diode has shorted through | A good chance here |
The diagnosis costs you nothing. Every item that arrives is logged under a case number of its own, and an engineer works out what has actually failed — then tells you plainly which files can come back and which cannot. The price follows that: one fixed figure, in writing, and no work begins until you have read it and said go ahead.
No lid comes off and nothing runs for long. A few minutes in the BIOS, then Disk Management, then Explorer, and it is down to one of three things: electronics to repair, a service area to rebuild, or file-system work carried out on a copy.
A shorted diode is removed and a fresh one fitted. Where the board is past saving, a donor takes its place and the ROM chip from your own board goes across, since the adaptive figures held in it were measured on your platters and suit no other drive.
The moment the drive answers, a full sector-by-sector copy is taken. Everything after that is done to the copy, and the drive itself goes back on the shelf untouched.
Nothing is billed while you are still deciding. A complete listing of what came off the drive reaches you first, and the invoice only follows your yes. Files travel back on media bought new for the job, return postage ours, and we do not close it here until every one of them opens on the machine you will use.
Hold on to this: nearly every drive that arrives here unseen by its computer has broken in the electronics or the firmware — the parts whose job is to introduce the disk, not the parts that keep what you put on it. A disk that does not appear is telling you about its hardware, no more than that.
The power went off overnight and the desktop came up next morning listing one disk instead of two. Nothing turning and no entry in the BIOS: the board had burnt right through at the TVS diode. Its ROM went to a donor board and a full image was taken inside two days of the drive arriving.
Usually it is. Boards get mended or swapped, and whatever killed one rarely reaches the platters or the NAND behind it. A drive showing no sign of life is among the more predictable things on this bench.
No, never. What that box wants to do is put an empty partition map over the one holding the addresses of your files. Say no, unplug the drive, and let someone look at it before anything else is allowed near it.
No. A disk absent from the BIOS has lost the ability to introduce itself, not the data it holds — the break is in the electronics or the service-area code, and your files sit in neither.
Almost certainly. The surge is caught by a protection diode, put there to die first and spare everything behind it. What you lose is a circuit board; what was written to the disk stays where it is.
A failing drive has only so many starts left in it. Spend none of them. Keep the power off, and the free diagnosis will tell you what is still readable.