Data Recovery Case File · NAS & RAID · Healthy Drives, Dead Landlord

"The drives seem to be OK. So—": finishing a well-diagnosed enquiry — two healthy disks, one dead enclosure, and the translation between

This enquiry arrived ninety per cent diagnosed, and its last word was literally "So" — the customer reaching the exact edge of what home tools can establish, and asking what comes next. The patient: a Buffalo LinkStation Pro Duo, two 500GB drives in RAID, "running happily for many years" until he moved it — after which it wouldn't power up: drives vibrating when power connects, but no fan, no lights. His reading: "some sort of PSU failure" — sound. His next test was better still: each drive connected individually to his PC appears in Disk Management, "but the RAID software stops the PC accessing it, as you would expect" — and his conclusion, "the good news is that the drives seem to be OK," was correct. So: here is the rest of the sentence.

Finishing the diagnosis: what died, and why "visible but blocked" is exactly right

His power reading decodes cleanly: a NAS's supply feeds several rails, and vibration without fan or lights is the signature of a partial PSU failure — enough current reaching the drives' motors to spin them, the rails serving the board, fan and indicators dead — which took the enclosure's brain offline while leaving its tenants healthy, precisely the split his tests then demonstrated. And his "as you would expect" deserves its expansion, because it's the part that catches most owners by surprise: a NAS is a small Linux computer, and it stores data its own way — Linux filesystems, RAID structures written per-member, the appliance's private arrangements — so a member drive on a Windows PC appears (the hardware is fine) but doesn't read (Windows speaks no Linux-RAID), and Disk Management's helpful offers to initialise the "unreadable" disk are, as ever in this archive, invitations to overwrite a healthy drive's foreign paperwork. He accepted none of them. What his situation needed was never repair — the drives required none — but translation: the RAID layer reassembled and the Linux filesystem read on equipment that speaks both, with the dead enclosure reduced to what it had always really been: a landlord, replaceable, whose tenants left with everything.

The translation

Both members were imaged write-blocked on the TaskForce 2 — healthy drives, quick work, originals untouched on principle — and the reconstruction ran on the copies: the LinkStation's RAID arrangement identified and reassembled from its members' own structures, the Linux volume above it parsed, and the many years of the unit's happy service rising as ordinary browsable files. Verification by opening documents and photos across the set; delivery on plain, Windows-readable storage — the collection's first day outside the appliance's dialect — with his two 500GB veterans returned intact and the delivery note's guidance covering the fork ahead: replace the enclosure's supply and the unit can serve again (empty, or rebuilt fresh), but the recovered data now lives independent of any single box, which is the arrangement his move-day surprise argued for all along.

Outcome

Full recovery by translation rather than repair — and the two lessons his ninety-per-cent diagnosis leaves for the archive. For the fault: moves are hard on power supplies too — jolted connections and aged components meet a fresh power-up, and "worked before the move" applies to enclosures as much as the drives this archive usually convicts; vibration-without-lights is the tell worth remembering. For the data: his "as you would expect" should be every NAS owner's expectation before the bad day — member drives are unreadable outside their box by design, so a dead enclosure always means translation, never initialisation, and the right response to Disk Management's offers is the refusal he gave them. His enquiry ended mid-sentence at exactly the right word. The trade exists for the clause after "So."

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.