Board-level faults · job log · NTG-2025-1753
The Fault Came Back With the Lights.
A digger on the neighbouring plot went through the cable supplying a builders' merchant in Gainsborough, and the yard did a morning's trade with no electricity. Once it returned, the office desktop got only as far as Default boot device missing
, while the BIOS contributed one line and no more: no drive found on either channel
. On that machine: nine years of supplier accounts, the stock and price file, and the photographs the whole website is built from.
Yours doing the same? Say what it is up to — looking is free.
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What went wrong, and why.
Everything is legible on the board. Sitting across the mains input is a small part put there to fail ahead of anything costly, and fail is what it had done. Electricity coming back is a rougher business than electricity going away, which is how kit that sits out a whole morning of darkness untroubled can be finished a second after the lights return. None of that reaches the recording. Files exist there as grains of magnetism, each one magnetised in a direction. A direction is not a charge, and a spike finds nothing there to act on. Which is why a disk that vanishes after an outage is usually an intact archive stuck behind dead electronics.
The bench work this one took.
How the work runs →| Kit on the bench | What it did on this job | Why we reach for it |
|---|---|---|
| ACE Lab PC-3000 Express | Proved the donor board before anything else: identity, SMART log, defect tables, all answering | Reaches the maker's own service mode, which standard ATA commands cannot |
| PC-3000 Data Extractor | Fed this drive's defect maps to the imager, then went at the surfaces | Reads through the drive's own firmware and controller instead of working round them |
| R-Studio Technician | Opened the NTFS volume on the image and walked the tree end to end | Rebuilds an array off the images, and reads almost any file system |
What happened on the bench.
Work out how far the energy actually travelled
Under magnification a spent sacrificial part is obvious, and identifying it settles almost nothing. What has to be established is how much further the spike went. A good deal of it routinely gets past that part. Further down the line are the motor driver and the interface chip. Neither was assumed healthy. Check the obvious component alone and the disk quits in the middle of imaging.
Carry this drive's own ROM across to the donor
Hunting down the correct board revision produced working electronics. What no donor can hand over is the memory chip that belongs to this one drive, so it was lifted off the damaged board and transferred. Written into that ROM on the production line are calibration figures describing one head stack across one set of surfaces, and describing nothing else in the world. Put a board on without them and the motor turns, the sound is entirely convincing, and what comes back is rubbish.
Defect map loaded before imaging begins
Its name and its full 2TB came back with the donor board on. Before a single sector was copied the defect tables had gone into the imager's configuration. No request needed repeating. Surfaces behave like that when the board is the only thing that has failed.
What was returned.
Inside a week the whole lot had been checked and returned on a new disk. A UPS now stands behind the till machine and the office one, and every night a second drive takes the supplier ledger.
Start here if the same thing is happening to yours.
Other jobs that started with the power.
Sounds like yours? Switch it off before anything else.
£250 + VAT covers a card or a USB stick; a single drive is £300 + VAT; RAID and NAS start from £500 + VAT. Nothing is charged for the first look, and a fixed figure reaches you in writing before any chargeable work begins. Switch the device off, leave it alone, and post it in. On most jobs, no data back means no fee.