Case record · Mac & Apple · SDR-2025-0621
It Mounted Slowly, So I Pulled It Out Too Soon.
Eleven years of lesson recordings on one Mac drive, and a house move in between. It did appear, after four or five minutes
, with everything else frozen while it thought about it — so she unplugged it. Now it won't show up at all
and First Aid says it can't be repaired
. No second copy exists.
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The translation.
The slowness was itself the diagnosis. When macOS mounts a volume it reads the catalogue first, and a drive fighting for those reads leaves the Finder waiting — the beachball belonged to the disk, not to a moody Mac. First Aid then compounds it in one particular way: it repairs filesystems, and its answer to trouble is to write. Against hardware that is quietly dying, writing is precisely the wrong reflex.
Kit used on this job.
What happens in a case →| Platform | Its role in this case | Why we use it |
|---|---|---|
| DeepSpar Disk Imager 4 | Imaged on cautious settings, with no further mounting allowed first | Head-map-driven imaging, with per-head timeouts, resets and power-cycle control |
| UFS Explorer Professional Recovery | Read the HFS+ volume out of the image with its catalogue intact | Handles the difficult filesystems better than most — APFS, ReFS, XFS, ZFS, Btrfs |
| ACE Lab PC-3000 Express | Established the spreading surface fault from firmware level | Talks to drives using maker-specific commands beyond the ordinary ATA instruction set |
In the lab.
No further mounting, and First Aid retired
The drive left the kitchen table and stopped meeting operating systems altogether. Firmware-level checks showed a surface fault spreading, and the worst of it sat exactly where HFS+ keeps its catalogue — which accounts for the four-minute mount and for First Aid giving up.
Take the catalogue areas first, and gently
Imaging followed a deliberate order: metadata regions before anything else, and slowly, since those are what turn raw sectors back into named recordings in dated folders. The bulk audio came next. Yanking the cable early had cost nothing beyond the read it interrupted.
Rebuild the Mac volume off the copy
The filesystem was rebuilt from the finished image rather than patched where it lay — that is the gap between eleven organised years and eleven thousand nameless files. Folders, filenames and dates survived alongside the audio.
The result.
The recordings came back in their original folders, checked on her own Mac before sign-off. Nine audio files from the weakest band returned truncated, and were listed as such.
Similar cases on the index.
Further Mac & Apple cases.
Does this sound like your own drive?
The rule holds as in every case above: switch it off, and let a free diagnosis come before any decision.