Data Recovery Case File · Trust, Practice & Honest Limits · An Honest Assessment

Opening It Answered One Question and Created Two More

His enquiry describes an investigation carried out in good faith. A clicking external drive where "I had a tool and took a quick look underneath, and there is a big scratch on the platter. It tries to boot up, which I hope is a good sign, but seems to get caught in a loop." He deserves a straight answer on all three parts — the mark may be less final than it looks, the opening has a cost of its own, and the repeated attempts are the thing doing active harm.

The decode: three separate things, answered plainly

First, what he saw may not be what it appears: a visible mark on a platter is not automatically a scratch through the recording layer. Material transferred from a failing head can leave a track that looks like damage and is deposit rather than removal — and the two are distinguished under magnification, not by eye.

Why that distinction decides a great deal: deposit can sometimes be worked around, and a genuine gouge through the recording layer cannot. Data in a scored region is physically gone, and no technique returns it — but the region affected is usually a band rather than the whole surface, and drives have several surfaces.

So the honest position: some loss is likely, and total loss is not implied. What can be read from unaffected surfaces and unaffected regions is frequently substantial, and how much depends on where the damage sits relative to the material he needs.

Second, what the opening cost: the interior is assembled in filtered air and sealed for a reason. Ordinary room air carries particles far larger than the gap heads fly at, so a drive opened outside a controlled environment has taken in contamination that will be dragged across surfaces the moment it spins.

Why that is not a reason to be hard on him: he was trying to understand his own situation, which is reasonable, and the information he obtained is real. The cost is that the drive now needs cleaning and handling it would not otherwise have required, which is work rather than catastrophe.

Third, and most urgently, the loop is not a good sign: he hopes that continued attempts indicate life. A drive repeatedly trying to start with a damaged surface and a failing head is grinding contamination and debris across the platters on every attempt — this is the part actively making things worse while it happens.

Why that inverts his reading: the effort he finds encouraging is the mechanism of further loss. Every cycle enlarges the affected area and reduces what the unaffected regions still hold.

What the work involves: the drive assessed under filtered air, the marking examined for depth and extent, contamination addressed, and imaging scoped to the surfaces and regions that remain readable. Recovery is partial by design in cases like this, and the aim is to establish what survives rather than to promise everything.

What must not happen: no further power-up, at all. Of everything in this case, that is the one thing still entirely within his control.

On the bench

The reported surface marking was assessed for depth and extent under filtered air rather than accepted at face value — visible tracks arising either from material transferred by a failing head, which is deposit, or from removal of the recording layer, which is irrecoverable in the affected band, the two being distinguished under magnification. Contamination introduced by opening was assessed and addressed, room air carrying particles substantially larger than head flying height. No further power-up was permitted, repeated start attempts dragging debris across surfaces.

The outcome

The marking assessed for depth and extent under filtered air, contamination addressed, and imaging scoped to unaffected surfaces and regions. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery. The decode: what you saw may be deposit from a failing head rather than a scratch through the recording, and only magnification tells them apart. But the loop you hoped was a good sign is the active harm — each attempt drags debris across the surfaces.

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.