Bench notes · Mains-powered externals · CDF-2025-0921
Connect the Drive and the Whole Machine Halts.
In Roath it had turned into a routine. Connect the Seagate and the PC freezes with the lights still on, and nothing moves again until I unplug it
. A folder window opened and then stopped redrawing. Pull the cable out and the machine came back instantly. Eight years of interviews, recorded for a local history group, sat on that disk, and one whole Sunday went on copying a single folder of them before it quit for good — which settled the question he needed answering: the interviews are definitely still on there, it just will not hand them over
.
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Why that happens.
Nothing was wrong with the PC. One disk had parked itself at the front of the queue and would not move. Storage requests are served in turn, so when a drive stops replying Windows waits out a timeout, asks again, waits out another, and everything else the machine has been asked to do piles up behind it. That is why a spreadsheet that had never been near the Seagate froze solid. The folder he managed to copy on the Sunday answered the important part: the file structure could still be read and the interviews genuinely were there. The recordings were not gone. What the drive had lost was the ability to pass them on.
What we used on this one.
Every step, in order →| The tools | What it did here | Why it helps |
|---|---|---|
| DeepSpar Disk Imager 4 | Held retries to a fixed limit, so no one sector could stall the copy | Maps the heads first, works surface by surface, and keeps resets, timeouts and power in hand |
| ACE Lab PC-3000 Express | Read the drive’s reallocated and pending counters before settling on a plan | Opens the maker's service commands, which a plain ATA link will not pass |
| UFS Explorer Professional Recovery | Mounted the finished image and lifted the audio out folder by folder | Reads the volume formats that defeat most software: APFS, ReFS, XFS, ZFS, Btrfs |
How it went.
Stop spending what it has left
The folder he got across was less recovered than borrowed, prised out of a mechanism already living beyond its means. The counters gave that a figure: reallocation well advanced, and the pending list growing every time somebody tried again. The best thing anyone could do for the drive now was leave it unplugged.
Knock twice on a bad sector, then move along
The imager ran to a strict budget: brief timeouts, two goes, then write down the address and keep moving. Good stretches copied at full speed. Anything that resisted was logged and saved for the final pass, tackled in short bursts a head at a time, so the disk gave up what remained at whatever rate it could manage.
Then play every minute of the lot
The image mounted first time, and eight years of interviews emerged in recording order. Signing off meant sitting and listening to them rather than adding them up, since a file can measure up to the byte and still contain a stretch of silence that never reached the disk.
Signing it off.
All of the folders came across and passed the listening check, including the half-copied one. The archive went onto new media, and a second set was made for the group’s secretary. The old Seagate has been retired, and the PC has run normally since.
Pages people often read next.
Filed beside Desktop externals.
Is that what yours is doing?
Power it down, get it to us, and hold off on any decision until the diagnosis says what can still be read.