NAS and network storage · ADR-2025-3171
The Unit Read Its Own Fault Out Loud.
He said he had done the research prior to writing to us. Upon boot-up, his Buffalo Linkstation played out an error sound followed by 6 flashes
, and according to the manual, that particular sequence is an indication of hard drive no longer being recognised
. Once he determined that, he did not continue to run the unit through further start-ups; he then proceeded to ask about the data, which is the proper order of operations when doing both of these items.
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What failed, and why.
Error codes indicate problems that the unit has diagnosed with itself. In this instance, the code is particularly specific. The unit is not indicating a networking issue, nor is it indicating a shared resource that cannot be mounted or software that cannot be executed: it is simply stating that it can no longer recognise the disk. This narrows down where the problem lies: inside the enclosure rather than outside it. There are three possible causes for a disk failing to present itself to a unit (its firmware will not operate properly, there is a defect in the circuit board, or there is a mechanical failure in the disk's operating mechanisms), and from outside they are indistinguishable from one another. Given that each type of cause requires a distinct method for correction, it is essential to determine which type of problem exists prior to initiating corrective actions. Therefore, identifying the correct course of action occurs before taking any other steps. As such, attempting additional start-ups settles nothing at all.
What the bench did with it.
The order of the job →| Equipment used | Its work on this job | The reason for it |
|---|---|---|
| DeepSpar Disk Imager 4 | Copied once the disk began presenting itself again, with retry limits set. | Mapped the heads first, then imaged one face of a platter per pass, with every reset, timeout and the power itself kept under our own control |
| UFS Explorer Professional Recovery | Opened the unit's Linux volume from the copy, and retrieved the contents. | When other applications will not open it, this application will open APFS, ReFS, XFS, ZFS and Btrfs. |
| ACE Lab PC-3000 Express | Accessed the disk's service area to determine why it could no longer identify itself. | This allows access to the manufacturer's service area (where normal ATA commands cannot go) |
What the bench did with it.
Stop starting the unit and take the disk out of it
No additional requests were submitted to the Linkstation. The error signal received indicates that this problem is not something that resolves with subsequent restarts of the system. Since any additional start-ups, where a mechanism is involved, increase the potential for damage while providing no information at all, we chose to remove the disk from the Linkstation and expose it to diagnostic tools capable of accessing it directly. This provided the only viable option available for establishing why it was no longer able to communicate with the Linkstation.
Establish which of the three faults it is
We reached the disk's service area first because if a disk’s firmware fails to initialise, it will never establish communication with any external device. We examined the board for defects and monitored the current draw. Only at that point could we develop a strategy for proceeding: what to address and in what order, and whether the mechanical component(s) had to be opened up at all.
A NAS disk does not read like a PC disk
Mounting the disk on a PC would have revealed unformatted space but would have proven nothing. Any files written to a network device are stored as a Linux volume, typically with a manager installed above the partition table. Thus, we opened the copy with software designed specifically for volumes formatted in this manner and recovered the shares, including their folder structures.
What went home.
We transferred all data off the copy (and onto new media) using exactly the same share/folder structure as they existed on the original Linkstation. We did not restore the Linkstation to operational status. All NAS/array services begin at the published £500 + VAT. Assessments ahead of this work are free and are not invoiced.
Begin here if yours is doing the same thing.
More Apple machines, written up.
Yours doing something similar? Power it down first.
Published prices are fixed. Memory cards and USB sticks are £250 + VAT. Any stand-alone drive is £300 + VAT. Drive configurations containing multiple disks (RAID, NAS or server) start at £500 + VAT. First assessments are always complimentary. Thereafter, data recovery charges are also fixed in advance and in writing, so you'll always know how much you owe before paying any money. Shut it down, get a quote first (by phone or with the form), then send it in or drop it off at our Guildford intake laboratory, Monday to Friday, 9am to 5:30pm (no appointment needed). On most jobs you only pay if we recover your data.