Knocks and impact · lab log · ADR-2025-3663
It Went Over, and It Still Sounds Right.
He said the drive has fallen over
, and that was the entire report of the incident. Usually, this is all anyone can give. He later placed the drive in an enclosure, and it can't be read by my other laptop
: powering up but not then connecting to the other laptop
. Therefore, it receives power, presents every indication of having sustained no damage, yet never presents a volume. Videos of his late son, who died in June, plus documents and downloads were stored on it. No backup existed.
Same story on yours? Tell us what it does — the look is free.
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What failed, and why.
Before a volume becomes visible, a series of steps has to occur. First, the motor spins the disks up to operating speed. Next, the heads read the drive's own firmware and calibrate themselves against it. Finally, the drive announces its identity. At that point, the enclosure's bridge provides some sort of information for a computer. Here, it received power and got no further than that. Therefore, the cause of the problem exists somewhere within the above series, and the knock is what makes it worth being careful. A drive that has been knocked can fail at any of those steps, and where the reason is mechanical, each successive attempt to access it will fly the heads across the surfaces once again. Sounding normal is not proof; it represents the lack of evidence of a specific type, and on a drive that has been knocked it is absolutely useless.
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 | Was asked to identify on a current-limited supply, with the draw profiled first | This allows access to the manufacturer's service area (where normal ATA commands cannot go) |
| DeepSpar USB Imager | Read through the caddy's own circuit board first to determine whether the caddy or the drive failed | Reads through the caddy's own USB board instead of going around it, at the rate permitted by the bridge |
| R-Studio Technician | Volume rebuilt using the image, and the video files opened and played through | Constructs an array from the images, and reads nearly every file system |
What the bench did with it.
Sounding right proves nothing at all
We measured the start-up current, the amount of time before it was operational, and what happened during the process, before attempting to communicate with it. Twenty minutes of measurement time distinguishes a job that can be completed quickly from one that gets only one very careful attempt, and after a knock there is no difference to be heard between those two.
Take the enclosure out of the question
A drive that powers up without presenting either fails at the drive itself or has a bridge board that provides no useful service. Both of these scenarios appear identical when viewed from a desk, and both are easily separated here: read the drive through the caddy's own board first, then access the drive directly. Of course, only one of these two possibilities involves opening anything, and it is worthwhile determining which before it is opened and not afterwards.
Image it once, gently, and work from the copy
Retries were suppressed throughout imaging and the difficult ground was left until a final pass-through, to avoid giving a drive that has been over too much credit for its reserves. All processes thereafter were performed on the copy made from the original. Video files were played instead of merely listed, because if a file cannot play it has not returned, regardless of what the list indicates.
What went home.
The videos were sent home on new media, played through here prior to leaving, accompanied by the documents and downloads. The drive provided no indications to suggest that a great deal was at stake regarding accessing its contents. For this reason, a drive that arrives after a knock is treated as though a great deal is at stake.
Begin here if yours is doing the same thing.
More jobs where files would not show and volumes would not read.
Yours doing something similar? Power it down first.
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