Data Recovery Case File · Desktop Externals & Aging Drives · Correlated, Not Coincidental
Two Drives Bought Together and Used Together Tend to Fail Together
His enquiry reports what he calls a stroke of bad luck. A 4TB drive holding a media library that "out of the blue no longer powers up", and — "in a stroke of bad luck" — a backup drive that has also broken. It is less unlucky than it feels: two drives of similar age, bought for the same purpose, kept in the same place and worked to a similar duty cycle share most of the factors that determine when they fail.
| Media | 4TB desktop external drive holding a media library, not powering on; a second drive kept as its backup, also failed |
| Reported situation | Desktop external drive holding a media library · drive ceasing to power up without warning · backup drive also failed · no content currently accessible from either · recovery sought from the primary drive |
| Fault class | Power-stage failure on the primary with a correlated failure on the backup — both requiring independent assessment; neither implicating the recorded content by the reported symptom |
| Equipment used | Both drives assessed independently rather than as one job · enclosures separated from the drives before assessment · each drive powered independently on a controlled bench supply with draw measured · board examined at component level where the enclosure was eliminated · imaging in one supervised session once power delivery was established |
The decode: why the second failure is not a coincidence, and what to do about both
Why simultaneous failures happen more than chance suggests: the two drives share nearly everything. Purchase date, manufacturing batch, ambient conditions, mains supply and duty cycle are common to both, and those are the factors that set a drive's working life.
Why a backup drive is not spared by being used less: the components that age chemically do so with elapsed time rather than with hours of operation. Board capacitors degrade on a shelf as well as in service, so a lightly-used backup of the same age is not meaningfully younger.
Why that undermines the intuition behind a second drive: a backup protects against the failure of one device, and it does so best when the two devices do not share their risks. Two identical drives on the same desk share almost all of them.
Why this is worth stating rather than glossing: the arrangement he has is what most people mean by a backup, and it did not survive. Copies that differ in age, in type or in location are what actually separate the risks.
Why not powering up is a favourable symptom despite appearances: the fault is at the power stage or before it. Nothing about the mechanism or the recording is implicated by a drive that never starts.
What the likely causes are: the mains adapter, the enclosure's own board, or the drive's power circuitry. The first two leave the drive inside entirely untouched, and both are common on desktop units of this kind.
Why the adapter deserves particular attention here: desktop drives use external supplies that fail more often than the drives they power. An adapter failure presents exactly as a drive that will not power, and it is the cheapest possibility of all.
Why the two drives must be assessed separately: they may have failed for different reasons. One may be an adapter and the other a board, and a single quotation covering both would be a guess.
Why the backup is worth assessing at all: it may be the easier of the two. If it holds the same content and its fault is simpler, the cheaper drive is the one to recover — which is worth establishing before committing to either.
What must not happen: no swapping adapters between the two. If one adapter has failed in a way that damages what it powers, using it on the second drive repeats the damage.
On the bench
Both drives were assessed independently rather than as one job — drives sharing purchase date, manufacturing batch, ambient conditions, supply and duty cycle sharing most of the factors determining working life, while components that age chemically do so with elapsed time rather than operating hours, so a lightly-used backup of the same age is not meaningfully younger. Failure to power places the fault at or before the power stage. Each drive was powered independently with draw measured.
The outcome
Both drives assessed independently, enclosures separated before assessment, and each powered on a controlled supply with draw measured. Free assessment, one fixed written figure including VAT, quoted per drive; 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: it is less unlucky than it feels. Two drives bought together and kept together share nearly every factor that decides when they fail — and a lightly-used backup of the same age is not meaningfully younger.
When a drive and its backup fail together
Have both assessed separately rather than as one job, and don't swap adapters between them — if one supply failed in a way that damages what it powers, using it on the second repeats the damage. Two drives bought together and kept together share purchase date, batch, environment, mains supply and duty cycle, which are the factors that set a working life, and components that age chemically do so on a shelf as well as in service. So copies that differ in age, in type or in location are what actually separate the risks. The backup may also be the easier recovery of the two.
Have both assessed — call Manchester Data Recovery on 0161 871 0788; assessed independently rather than as one job, enclosures separated, each powered on a controlled supply with draw measured.
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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.