Data Recovery Case File · Second Fixes & Trade Handoffs · Opened, With a Verdict
A Drive That Has Been Opened Carries a New Question Alongside the Original Fault
His enquiry arrives with a diagnosis from someone who has already been inside. A portable drive with slow reading which "had been opened by one service specialist", whose finding was that the platters are sound and the heads are not. The verdict is plausible and checkable — and the opening itself introduces a second question that has to be answered before the first one matters.
| Media | 1TB portable hard drive with degraded read performance — previously opened by a third party; platters reported sound and head assembly reported faulty |
| Reported situation | Portable drive exhibiting slow reading · drive opened by a service specialist · platters reported as sound by that party · head assembly reported as faulty · approximately 500GB of photographic and video content held · assessment invited by the owner |
| Fault class | Head degradation with prior opening performed — contamination status unestablished; surface condition to be verified before the reported diagnosis is relied upon |
| Equipment used | Contamination from prior opening assessed before the reported diagnosis was relied upon · no power-up permitted pending inspection · laminar flow bench inspection with platter surfaces examined for particulate and scoring · matched donor head assembly fitted where surfaces proved sound · imaging in one supervised session under capped timeouts |
The decode: two questions in order, and why the second comes first
Why the reported diagnosis is plausible: slow reading is a classic head symptom. Heads that have degraded read marginally, requiring repeated attempts per sector, and latency is what that produces at the user's end.
Why the platters being sound would be consistent: head degradation is not the same as head contact. A head that reads poorly has not necessarily touched the surface, so a report of clean platters alongside failing heads is a coherent finding rather than a contradictory one.
Why that verdict nonetheless cannot simply be adopted: it was made before or during an opening whose conditions are unknown. What the platters looked like then is not necessarily what they look like now.
What an opening introduces regardless of the operator's skill: the possibility of contamination. The clearance between a head and the surface is smaller than an airborne particle, so a single particle admitted during the opening sits above the recording waiting to be struck.
Why that is only a possibility rather than a certainty: an opening performed under filtered air admits nothing. Whether this one was is unknown, and it is answerable by looking.
Why the drive must not be powered until it is: particles do their damage the moment the platters turn. A drive opened in ordinary air is frequently unrecoverable within seconds of being spun, and it will look fine until then.
Why that reverses the natural order of the work: the instinct is to confirm the head diagnosis by running the drive. Confirming it that way is the thing most likely to make it academic.
What is done instead: the drive is inspected under filtered air with the surfaces examined for particulate and scoring before any rotation. That answers the contamination question directly and costs nothing but time.
What follows if the surfaces are clean: the reported diagnosis stands and the work is a matched donor head assembly. That is ordinary mechanical recovery with reasonable prospects, and the previous specialist will have saved a diagnostic step.
What follows if they are not: the honest position changes and should be stated before anything is committed. Scoring on the surfaces limits what any head can read, however good the replacement.
On the bench
Contamination from prior opening was assessed before the reported diagnosis was relied upon — degraded heads reading marginally and requiring repeated attempts, which produces latency, and head degradation being distinct from head contact so that sound platters alongside failing heads is coherent. Head-to-surface clearance being smaller than an airborne particle, an opening admits possible contamination which damages surfaces the moment rotation resumes. No power-up was permitted pending inspection under the laminar flow bench.
The outcome
Contamination assessed before the diagnosis was relied upon, no powering permitted pending inspection, and surfaces examined for particulate and scoring before any rotation. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery. The decode: the diagnosis you were given is coherent and there is a prior question. A drive that has been opened may carry particles, and those do their damage the moment it spins — so it must be looked at before it is run.
A drive that someone has already opened
Don't power it to confirm what you were told — that's the one action most likely to make the diagnosis academic. The clearance between a head and the recording surface is smaller than an airborne particle, so an opening in ordinary air can leave particles sitting above the platters that do their damage the instant rotation resumes, and the drive looks fine until then. The reported finding may well be sound: degraded heads read marginally and produce exactly the slowness you saw, and that's distinct from heads having touched the surface.
Don't power it — call Manchester Data Recovery on 0161 871 0788; contamination assessed before the prior diagnosis is relied upon, no powering pending inspection, surfaces examined before any rotation.
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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.