Data Recovery Case File · Portable Drives · The Difficult Parts

Half a drive at a time: mapping the good territory and the bad — and why the right order is image everything, then negotiate

His description drew the map before the bench did. The WD My Passport 1TB — around four years old, "may have been knocked or dropped at some point in the past" — still works, partially: recognised by the operating system, some files accessible. But "some data cannot be read, and this makes the system hang while attempting to read bad parts of the drive." No unusual clicks or crunches; the drive "seems to sound normal — but obviously cannot read some parts of its own disk." His request was phrased with the modesty of someone who suspected the answer might be no: a quote for recovery, "if indeed it is possible," of the parts which are being difficult. It is possible — and the half-alive drive is its own genre, with its own trap, which this page exists to disarm.

The geography — and the cherry-picking trap

A drive in his condition has become a map with bad districts: regions of the platter surface — quite plausibly seeded by that half-remembered knock, since minor impacts sow damage that ordinary wear then cultivates for years — where the media no longer yields clean reads, surrounded by territory that still serves perfectly. The system hangs because of the mechanism this archive's stall cases keep decoding: storage requests wait, and a read into a bad district triggers the drive's internal heroics — retry upon retry — while the computer queues politely on an answer that comes late or never. No noise, because nothing mechanical is failing; the quiet is genuine, and it's why his prognosis was always better than his modesty feared. Now the trap, because it catches exactly the capable owners: faced with a half-working drive, the natural plan is to cherry-pick — copy the good files off yourself, folder by folder, and worry about the difficult parts later. It feels prudent. It is the opposite, for two compounding reasons: every session runs the gauntlet blind, and each accidental step into a bad district doesn't just hang the machine — it commissions another storm of internal retries over the failing surface, wearing the bad districts wider while you're trying to save the good ones; and the good territory itself degrades with hours-of-operation on a drive already declining. The professional inversion is the whole method: image first, everything, in the right order — the healthy majority banked fast while the drive is at its best, the difficult districts deliberately deferred and then negotiated last with error-managed, bounded reads that take an answer or take a boundary, never a hang. His decision to stop browsing when he noticed the pattern was the trap, declined.

The recovery — the difficult parts, under management

The imaging ran precisely that order on the PC-3000 through the USB Stabilizer: the drive's serviceable expanse — the substantial majority — captured at pace in the early sessions, banked and safe before any confrontation; then the difficult districts, mapped and approached with the patience his own computer couldn't offer — retries bounded, reads coaxed under varied conditions, the stalls that had frozen his system replaced by managed negotiation that took what each pass could honestly give. Coverage closed in the high ninety-nines, and the honest ledger did what this genre's ledgers should: the "parts being difficult" recovered in the substantial main, with a small, itemised residue at the worst of the bad districts — named files, not silent gaps. The volume mounted whole from the image; his contents were verified by opening files from both territories, the formerly-hanging population deliberately among them; and delivery landed on new media, the four-year veteran retired with its districts documented and its quiet soundtrack, for once, beside the point.

Outcome

The difficult parts recovered, the easy parts protected on the way — and the half-alive doctrine filed for every owner currently copying good folders off a partly-bad drive. Partial function is an invitation to make things worse gently: the drive that still mostly works tempts exactly the browsing and cherry-picking that wears its bad districts wider, and the counter-intuitive right move is to stop using the good half in order to save all of it. Note which files or folders hang the system — that's a real map, and his version shortened the assessment — then let the imaging run in the professional order: bank the healthy, negotiate the difficult, itemise the residue. "If indeed it is possible" was his hedge. It usually is, in this genre — precisely as long as the good half hasn't been spent looking for out.

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.