Data Recovery Case File · Desktop Externals & Aging Drives · Not an Improvement
Freeing a Jammed Spindle by Force Drags the Heads Across the Surface They Were Resting On
His enquiry reports an intervention that felt like progress. A drive pulled off a table while connected, where "the motor had jammed and I managed to get it back to the clicking sound, so I'm not sure if disc or heads were damaged" — and he has an identical spare unit, asking whether the platters could simply be swapped. Going from jammed to clicking is not recovery: it is the sound of heads that were stationary now moving across the recording.
| Media | Hard drive subjected to impact while connected — spindle initially seized, subsequently freed by the owner; drive now producing repeated positioning attempts; identical unused unit available |
| Reported situation | Drive pulled from a table while connected by cable · spindle found to be jammed on inspection · owner freeing the spindle manually · drive subsequently producing impulse sounds · uncertainty expressed as to whether platters or heads are damaged · identical unused drive held by the owner · platter transfer proposed |
| Fault class | Head-to-surface contact following manual release of a seized spindle — surface condition materially altered by the intervention; assessment required before any further rotation |
| Equipment used | Manual release identified as having introduced surface contact rather than resolved the fault · no further power-up permitted · laminar flow bench inspection with platter surfaces examined for scoring before any rotation · matched donor head assembly where surfaces proved sound · platter transfer considered only where the spindle itself proved unrecoverable |
The decode: what jammed meant, and what freeing it did
Why a spindle jams after an impact: the heads are on the platters. A drive struck while running can drop its heads onto the recording surface, and once there they can bond to it — the motor is then trying to turn against that contact.
Why the drive stopped rather than continuing: it protected itself. A motor unable to turn stops rather than driving indefinitely, and at that moment the heads were stationary on the surface.
Why that state was better than it sounded: stationary contact damages one spot. Heads resting on a platter mark the area beneath them and nothing else, so the remaining surface was untouched.
What freeing the spindle did: allowed movement. Turning the platters while the heads were still down drags them across the surface in an arc, and every rotation extends it.
Why the resulting clicking is the confirmation rather than the improvement: the drive can now spin and cannot position. Heads damaged by contact fail to find their tracks, retry and reset — which is what he can hear.
Why his uncertainty is the right question: he asks whether the discs or the heads are damaged, and it is the question the case turns on. Damaged heads are replaceable; damaged surfaces are not.
Why that is answered by looking rather than by testing: the surfaces are inspected under filtered air before any rotation is attempted. Running the drive to find out is the one action that would settle it and make it worse.
Now his proposal, which is more apt here than it usually is: he has an identical unused unit and suggests moving the platters. Where a spindle has genuinely seized, platter transfer is one of the few cases in which it is indicated.
Why it is nonetheless not the first choice: the spindle now turns. A drive whose motor was freed may not need the platters moved at all, and replacing the head assembly leaves the disks undisturbed.
Why his spare unit is valuable regardless: it is a matched donor. Identical model and generation is exactly what a head assembly transplant requires, and having one already saves both sourcing and cost.
On the bench
Manual release was identified as having introduced surface contact rather than resolved the fault — an impact during rotation dropping heads onto the recording surface where they may bond, so a seized spindle indicates stationary head contact damaging only the area beneath. Turning the platters while heads remain down drags them across the surface in an arc, extending damage with every rotation, and the resulting impulse sounds reflect damaged heads failing to position. Surfaces were examined under the laminar flow bench before any rotation.
The outcome
The manual release identified as having introduced contact, no further powering permitted, and surfaces examined 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: jammed was the better state. The heads were stationary on the surface, marking one spot — and turning the platters moved them across it. Your matched spare is genuinely useful, most likely for its head assembly rather than for its platters.
If a drive's motor will not turn
Don't free it, and don't power it afterwards if you already have. A seized spindle after an impact usually means the heads have dropped onto the platters and bonded there — which is bad, but stationary contact only marks the area directly beneath them. Turning the platters with the heads still down drags them across the surface in an arc, and every rotation extends the damage. Keep the identical spare you have: it's a matched donor, and its head assembly is likely to be worth more to this than its platters.
Stop powering it — call Cambridge Data Recovery on 01223 655015; manual release assessed as having introduced contact, surfaces examined under filtered air before any rotation, matched donor used where indicated.
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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.