Plug-in drives · read under load · ADR-2025-2887
Steady Until You Asked It for Something.
It had simply stopped working one day, in her account, and it had done so in the way that makes people buy new leads. The 1TB Toshiba still appears on desktop
— there it sits, mounted, apparently in order — and yet she cannot open any folders or copy them because it ejects itself
. Every attempt finishes the same way. The photographs on it are of her son, who passed away, and there is no second copy of them anywhere.
Same story on yours? Tell us what it does — the look is free.
0203 0868633
What failed, and why.
Mounting settles a whole set of questions at once. The lead carries signal, the socket makes contact, the enclosure powers up, and the disk got far enough to announce itself and have a volume put on the desktop. None of that is where the trouble is, which is why a new lead changes nothing and why a different port changes nothing either. What has not been tested by any of that is reading, and reading is the only part that costs a disk anything. Ask it for a folder and the draw goes up, the heads move, and a fault that is invisible at rest has something to do. The disconnection you see is a Mac being polite about a device that stopped answering partway through, and the warning is put on screen at the exact moment the disk needs to be left alone. There is no way to persuade a drive out of that state by repeating it, and every repetition is another read attempt on a disk that has already failed one. One drive on its own carries a published price of £300 + VAT.
What the bench did with it.
The order of the job →| Equipment used | Its work on this job | The reason for it |
|---|---|---|
| ACE Lab PC-3000 Express | Health profiled under read load rather than at rest | Gets into the manufacturer's service area, where ordinary ATA commands cannot go |
| PC-3000 Data Extractor | Copied with the retries capped, so a lapse costs seconds | Works with the drive's firmware and controller directly rather than around them |
| UFS Explorer Professional Recovery | The Mac volume read off the copy, and the photographs opened one at a time | Opens APFS, ReFS, XFS, ZFS and Btrfs when other software will not |
What the bench did with it.
Watch it while it is working
Sitting still, it looked like a healthy disk: it identified itself properly, reported the right size, and had a defect list you would not think twice about. Under load it was another thing entirely. Ask for a sustained read and the rate fell away, the disk stopped answering, and the interface reset itself — which on a Mac desktop is exactly what she had been watching happen, several times a day, for a fortnight.
Out of the case first
Before anything was concluded about the disk, the enclosure was ruled out. A bridge board that browns out under current, or a socket that no longer sits tight, produces the identical symptom and is a far cheaper problem to have. So the disk came out and went onto controlled power with its own connector, and it behaved in precisely the same way there. That put the fault in the disk and made the rest of the job straightforward to plan.
Cap the retries and keep moving
The whole point of imaging a disk like this is that it never has to be asked twice. Retries were capped low, awkward regions were left for a later pass, and the copy kept moving instead of arguing with any one sector. The photograph areas were read before anything else on the volume.
What went home.
The photographs came back and were opened rather than counted, which is the only way anybody knows. They went home on new media with a second copy alongside, because a single drive holding the only version of something is the whole reason this trade exists. The Toshiba has been retired. That is the published single-drive figure of £300 + VAT, put in writing before the work began.
Begin here if yours is doing the same thing.
Further portable-drive jobs, written up.
Yours doing something similar? Power it down first.
Prices are published and fixed. Memory cards and USB sticks are priced at £250 + VAT. A drive on its own comes to £300 + VAT. Anything holding a second disk, whether RAID, NAS or a server, opens at £500 + VAT. The first look costs nothing, and the figure that follows is fixed and in writing before a penny is charged. Switch it off and post it in. Most jobs carry no fee where no files return.