Data Recovery Case File · Trust, Practice & Honest Limits · Visible Damage Is Not Severity

The Drive That Looks Ruined Is the More Recoverable of the Two

This enquiry submits two drives and asks how confident anyone can be. One has "mild liquid damage — rust and light burn marks on the control board"; the other is "making a noise implying the platters are being hit by the read heads." The first looks far worse and is the better prospect, because visible damage sits on the electronics while the audible one describes damage happening to the recording itself.

The decode: why appearance and severity run in opposite directions here

What the corrosion and scorching actually tell us: current went somewhere it should not, and the board suffered for it. That is visible, alarming and confined — the marks are on the electronics, which sit outside the sealed assembly.

Why electrical damage stops there: the interior of a drive is sealed and its air is filtered. Liquid and current reach the board and not the platters, so the recording is untouched by an event that leaves the outside looking destroyed.

What the work on that drive involves: the board examined at component level, damaged components identified, and where repair is not viable the drive's own configuration memory transferred to a matched replacement board. That memory is specific to the individual drive, which is why boards cannot simply be exchanged.

Why the prospects there are good: the mechanism has not run in a faulty state and nothing has crossed the recording. The job is restoring a working path to intact data, which is among the more predictable kinds of recovery.

What the second drive's sound describes instead: contact between heads and surfaces. Heads are supposed to fly above the platters and never touch them, so a sound consistent with contact means the recording layer is being physically disturbed.

Why that is the worse of the two by a wide margin: a scored region is gone. No head, board or technique returns data from a surface where the recording layer has been removed — and unlike an electrical fault, this damage grows for as long as the drive runs.

Why the outward appearance of that drive is irrelevant: it will look entirely normal. The damage is inside a sealed assembly and invisible without opening it, which is exactly why the sound matters more than the sight.

What this says about judging severity generally: visible damage is damage that happened outside. The parts that matter are sealed, so the worst faults are frequently the ones with nothing to see — and a drive that looks perfect and sounds wrong is more worrying than one that looks burnt.

What can honestly be said about confidence, since that is the question: for the corroded drive, good, subject to confirming the damage is board-confined. For the second, partial at best, depending on how much surface is affected and how much has been added by running it — and that cannot be estimated from outside.

What must not happen to the second drive meanwhile: no powering it at all. Every rotation extends the affected area, and it is the one variable still under anyone's control.

On the bench

Visible damage and audible symptom were assessed separately with prospects ranked accordingly — corrosion and scorch marking indicating current through a fault path confined to the circuit board, which sits outside the sealed assembly so the recording is unaffected, whereas sound consistent with head contact indicates physical disturbance of the recording layer, which is irrecoverable in affected regions and progressive while the drive runs. The corroded board was examined at component level under a current-limited supply, and no further powering of the second drive was permitted.

The outcome

The two drives assessed separately with prospects ranked, the corroded board examined at component level, and the second drive inspected under filtered air with no further powering. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery. The decode: the one that looks ruined is the better prospect. Electrical damage stops at the board, which sits outside the sealed assembly — while a sound like head contact describes damage to the recording itself, which grows every time it runs.

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.