Data Recovery Case File · Apple Mac · Finishing a Migration

Copy of a copy, or the original: a stalled Apple Store handover, a stick that couldn't carry it — and the rest of the data recovered from where it always lived

The enquiry described a relay race stalled at the final baton pass. Her partner's ten-year-old iMac had died — graphics first, the classic opening for machines of that vintage — and the Apple Store had done genuinely useful work: transferring "a lot of the data" onto the new iMac he'd bought. But the new machine had less storage than the old, so the remainder wouldn't fit — and the couple dropped off a 250GB memory stick to carry the rest. The store's report back: they could see the disk image, but they couldn't get the rest of the data. Her offer: collect the old iMac from the store and bring the whole situation round. Exactly right — because the answer to "the rest of the data" was never going to be on the stick. It was still where it had lived for ten years.

The decode: why the stick failed — and the source principle it teaches

What the store's phrase describes is a familiar migration artefact: data staged for handover gets wrapped in a disk image — one large container file — and containers fail in mundane, terminal ways: a copy interrupted or truncated (a 250GB vessel receiving a remainder that, with the old machine's decade of accumulation, may simply not have fitted), an image finished but internally damaged, a format the receiving tools couldn't mount. "Can see it but can't get the data" is the honest report of a wrapper present and contents unreachable — and the critical insight, the one this page exists to publish, is that none of that matters, because a failed intermediary is only a disaster when it's the last copy. Here it was a copy of a copy: the old iMac's internal drive — the original, authoritative, ten-year source — still sat intact inside the dead machine, killed by its graphics card and not its storage, holding every byte including "the rest." The source principle, stated for every migration ever stalled: when a transfer's vessel fails, go back to the source — and never let the source be dismantled, wiped or recycled until the destination is verified complete. Her instinct to collect the whole old machine, rather than accept defeat over the stick, was the principle in action. The Apple Store, for the record, gets its fair credit: the graphics diagnosis, the bulk migration, and the honest "we can't" were all sound work — the stick was simply the wrong vessel for the last leg, and the last leg is what specialist benches are for.

The recovery — the migration, finished from the original

The old iMac came in as offered; its internal drive — a decade-serving unit, healthy in the way of drives whose machines die around them — was extracted and imaged write-blocked, the original preserved on principle even in easy cases. From the image, the migration was completed properly: the already-transferred set reconciled against the source so nothing was assumed, and "the rest" — the overflow the new iMac couldn't hold and the stick couldn't carry — extracted in full, verified by opening files across it, and delivered on a new external drive sized for the job (the honest answer to a smaller new Mac being more storage beside it, not a 250GB stick doing an archive's work). The stalled image on the stick was examined for completeness's sake and confirmed as the truncated container the decode predicted — owed nothing, mourned by no one — and the ten-year iMac was returned with its drive reinstated, retired whole, its decade's contents now living in two places its graphics card can't reach.

Outcome

The migration finished from the source — and the checklist this stalled relay leaves for every machine-to-machine move, Apple Store-assisted or otherwise. One: the old machine is the master copy — keep it intact until the new one is verified complete, every folder, not "most of it"; the moment to recycle, wipe or trade in is after the audit, never before. Two: size the vessel honestly — a decade of data rarely fits the stick in the drawer, and a smaller new machine means budgeting for external storage as part of the purchase, not discovering the arithmetic at the counter. Three: partial migrations are unfinished, not failed — "we couldn't get the rest" from any shop is a handover to a bench, not a verdict on the data. Her partner's decade came through complete because the couple kept the source and asked the next question. That's the whole method, and it fits on a sticky note on any old machine awaiting its send-off: not yet.

Our case files are drawn from genuine enquiries received by our laboratory over the past ten years, anonymised to protect client confidentiality. Each one describes the diagnostic and recovery procedure our engineers apply to that fault, using the equipment listed.