A six-bay QNAP striped as RAID 0. One disk failed and the entire volume went with it — because RAID 0 has no parity, no mirror, and nothing whatsoever to fall back on.
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The NAS would not start. One of the six drives had failed and was beeping — the sound of a spindle motor straining against a seized platter stack, not a drive that is merely confused. The array was gone, the shares were gone, and QNAP's own support had told the client what QNAP support always has to tell people in this position: RAID 0 has no redundancy, and there is nothing they can do.
There was no backup. The volume held the business's project files, media archives and operational documents.
Three findings, in order of consequence:
Not a dropped connection, not a firmware sulk — the beeping was real.
, which is why the QNAP would not even acknowledge the array's existence rather than simply reporting it degraded.
This is the part people find hardest to accept. RAID 0 stripes each file across all six disks, so losing one member does not remove a sixth of the files — it removes a sixth of every file. A six-disk RAID 0 is six times more likely to fail than a single drive, and it fails totally.
The array was reconstructed from the six clones and the data returned on external media.
We are not going to quote you a percentage, and we would be sceptical of anyone who does. What a RAID 0 recovery actually delivers depends on one variable and one only: how completely the failed disk can be imaged. Where donor heads read the platter cleanly, everything comes back. Where they cannot, the loss is distributed across every file rather than concentrated in a few — because that is precisely what striping does. Large files suffer most, and a document missing a stripe is not a damaged document, it is confetti.
That is why the honest answer at the diagnosis stage is a range, not a number, and why the range narrows only once the failed disk is on the bench.
RAID 0 is not a RAID. It is a performance mode that borrows the word. It offers the largest capacity number and the best benchmark, and on several NAS models it is what you get by accepting the defaults — which is how most people end up running it without ever having chosen it.
If you have a NAS, go and check which level it is actually configured in. Today. It takes two minutes, and it is worth more than anything we can do for you afterwards.
And if a disk has already dropped: power it down and do not rebuild.
Drop the drive at our Quayside reception, or post it to us — it costs nothing to find out what happened. You get a written figure from the fixed bands before any work begins.