Data Recovery Case File · Trust, Practice & Honest Limits · The Process, Explained
An Assessment Establishes What the Drive Returns Before Anyone Quotes for Returning It
Her enquiry asks the question most people do not think to ask. A laptop drive that failed and refused to start beyond the firmware screen, already removed by her husband, with no interest in repairing the machine — and then: "at worst I only need three or four documents, but as many files as possible would be best. How do you make your assessment on what can be recovered?" That deserves a real answer, because the assessment is where the whole engagement is decided.
| Media | Laptop hard drive removed from a machine halting at the firmware configuration screen — condition unestablished; a small number of documents identified as the minimum objective |
| Reported situation | Laptop failing to start beyond the firmware configuration screen · drive removed from the machine by the owner · repair of the machine not required · a small number of documents identified as essential · fullest possible recovery preferred · owner asking how feasibility is determined before committing |
| Fault class | Drive not presenting to firmware — condition to be established by measurement before any recovery route is chosen; essential content identified in advance |
| Equipment used | Assessment sequence explained to the owner before work began · current draw measured across the start-up cycle on a controlled bench supply · service area read under strict timeouts in vendor technological modes · surface behaviour sampled across the address range before full imaging · findings and a file listing supplied before any figure was agreed |
The decode: what an assessment actually does, in order
The first step, and it happens without any host: the drive is powered on controlled equipment. Current draw across the start-up cycle shows whether the motor reached speed and whether the heads attempted to position, which separates electrical from mechanical faults in minutes.
Why that is done before anything is connected: connection is a risk. A host tries to read a drive the moment it appears, and on a mechanically faulty drive that is the worst thing that can happen.
The second step: the drive is asked to identify itself. Equipment that addresses it directly can request its identity and capacity with imposed timeouts, rather than waiting indefinitely as a computer would.
What a failure at that stage indicates: the drive cannot read its own configuration. That points at the reserved region holding its parameters, which is repaired in diagnostic modes rather than by any host.
The third step, once it identifies: its surface is sampled. Reads are taken across the address range to establish which regions return normally, which return slowly and which do not return.
Why sampling rather than reading everything: speed and safety. A sample gives the shape of the problem in a fraction of the time and a fraction of the wear.
What that sample produces: the answer to her question. The proportion of the drive reading normally, and where the difficult regions sit, is what determines how much can be recovered.
Why her documents change the assessment usefully: a small target is easier to promise. Once the filesystem is readable, specific files can be located and their regions checked directly.
Why that matters for her decision rather than ours: she can be told before committing. Whether her three or four documents sit in healthy regions is knowable at assessment, not afterwards.
What she receives at the end of it: findings, a listing where one can be produced, and one fixed figure. The figure does not change afterwards, and where nothing is recovered, nothing is charged.
On the bench
The assessment sequence was explained to the owner before work began — current draw measured across the start-up cycle on controlled equipment to separate electrical from mechanical faults without any host connection, followed by a request for identity and capacity under imposed timeouts, then surface behaviour sampled across the address range to establish which regions return normally, slowly, or not at all. That sample determines recoverable proportion in a fraction of the time and wear of a full read.
The outcome
The sequence explained before work began, draw measured across the start-up cycle, and surface behaviour sampled before any full imaging. Free assessment, one fixed written figure including VAT; where a drive has to be opened, 50% of parts and labour is payable upfront with the balance only on success — otherwise no recovery, no fee. The decode: the assessment samples the drive rather than reading all of it. That gives the shape of the problem quickly — including whether your three or four documents sit in the healthy part.
Understanding an assessment before you agree to one
Ask exactly as you have, and expect a sequence rather than a verdict. A drive is first powered on controlled equipment with no host attached, since current draw across start-up separates electrical from mechanical faults; then asked for its identity under imposed timeouts; then sampled across its address range to find which regions read normally. That sample is what determines how much is recoverable. Naming the few files you genuinely need helps — whether they sit in healthy regions is knowable at assessment.
Ask for the sequence — call Cambridge Data Recovery on 01223 655015; draw measured before any host connection, surface sampled across the address range, findings and a listing supplied before any figure is agreed.
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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.