Data Recovery Case File · Second Fixes & Trade Handoffs · A Diagnosis to Confirm
A Head Failure Is a Specific Finding With Specific Requirements
His enquiry arrives with a prior assessment attached. A portable drive holding valuable data, which "a different company has already diagnosed as a failure of the read/write head stack assembly." That is a precise finding, not a vague one — it names the mechanism, and if correct it commits the work to a particular path: matched donor heads, fitted under filtered air, in a job priced for opening the drive rather than for a simple read.
| Media | 2TB portable hard drive — prior external diagnosis of read/write head stack assembly failure; valuable content held |
| Reported situation | Portable drive holding valuable data · prior diagnosis by another company · diagnosis stating a read/write head stack assembly failure · drive brought for recovery on that basis · contents required |
| Fault class | Reported head assembly failure requiring confirmation — donor-head replacement under filtered air indicated if confirmed; upfront terms applying to the opening |
| Equipment used | Prior diagnosis confirmed independently before committing to head replacement · matched donor head assembly sourced against the specific drive · laminar flow bench head replacement with alignment preserved · single controlled read pass following replacement · imaging in one supervised session |
The decode: what the finding means and what it requires
What a head stack assembly does: it carries the read/write heads that float over the platters, and it is the part that actually reads the data. When it fails, the platters and the data on them are usually fine — but nothing can read them, which is why a head failure presents as a drive that spins and returns nothing, or that makes a repeating sound as heads that cannot function attempt to load.
Why the diagnosis being specific is useful: "head stack assembly failure" is not a guess at a symptom, it is a named component. If the previous company assessed it properly, they identified the mechanism, and that tells us what the job requires before the drive is even opened.
Why it must nonetheless be confirmed independently: a diagnosis from elsewhere is a starting point, not a certainty. The finding is confirmed on assessment before committing to head replacement — because the response to a head failure is opening the drive and replacing parts, which is not something to undertake on an unverified report.
What confirming it commits the work to: a head replacement is a clean-environment operation. The drive is opened under filtered air, a matched donor head assembly is fitted, and alignment is preserved through the swap — the heads must match the specific drive, and their positioning relative to the platters is what determines whether the data can be read afterwards.
Why the donor match matters so much: heads are manufactured to fine tolerances and paired to a drive's characteristics. A donor assembly has to come from a compatible drive, and sourcing the correct one is part of the work — the wrong heads read nothing or, worse, damage the platters.
Why this is honestly priced differently: opening a drive and replacing its heads is skilled physical work in a controlled environment, not a matter of reading a drive that still functions. Where a drive has to be opened, part of the parts-and-labour cost is payable upfront, with the balance only on a successful recovery — which reflects the real work a head replacement involves.
Why a single careful read pass follows replacement: once donor heads are fitted, the drive is read once, carefully, to capture as much as possible before any further mechanical stress. A drive that has already suffered a head failure is read conservatively, not repeatedly.
What must not happen: no powering the drive up to test the diagnosis, and no attempts to make it read as it is. If the heads have failed, running the drive risks the platters — the surfaces the data lives on.
On the bench
Prior diagnosis was confirmed independently before committing to head replacement — a head stack assembly carrying the heads that read the platters, so its failure leaves the data intact but unreadable and presents as a drive spinning without return or sounding as heads fail to load, with an external diagnosis being a starting point rather than a certainty. A matched donor head assembly was sourced against the specific drive, and laminar flow bench head replacement performed with alignment preserved, followed by a single controlled read pass.
The outcome
The prior diagnosis confirmed independently, a matched donor assembly sourced, and head replacement performed under filtered air with a single controlled read pass. Free assessment, one fixed written figure including VAT, with 50% of parts and labour payable upfront where the drive is opened and the balance only on a successful recovery. The decode: a head failure is a specific finding. It leaves your data intact but unreadable, and confirming it commits the work to opening the drive and fitting matched donor heads under filtered air — so the drive must not be powered up to test it, which would risk the platters.
A drive diagnosed elsewhere as a head failure
Don't power it up to test the diagnosis — if the heads have failed, running the drive risks the platters your data lives on. A head stack assembly failure is a specific finding: it carries the heads that read the surfaces, so when it fails the data is usually intact but nothing can read it, which is why the drive spins and returns nothing or makes a repeating sound. An external diagnosis is a starting point worth confirming independently, because the response — opening the drive and fitting matched donor heads under filtered air — isn't undertaken on an unverified report. That's skilled physical work, which is why opening a drive carries upfront terms.
Don't power it to check — call Easy Data Recovery on 028 9002 0144; prior diagnosis confirmed independently, matched donor assembly sourced, head replacement under filtered air with a single controlled read pass.
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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.