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Disk 1 suddenly disabled on Unraid 7.2.3

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Is it one of those hiccups possibly caused by a failing SATA cable? I'm not seeing real SMART errors on any of the disks but maybe the diagnostics show more. See attached.

tdvault-diagnostics-20260129-0426.zip
I can follow the instructions to rebuild that disk 1 back on top of itself if that's wise, but I could also replace the disk, if needed.

Thanks.

  • Community Expert

Disk1 disconnected and is now unassigned. SMART for that disk looks OK. Emulated disk1 is mounted and has 4.6TB data.

Check connections, both ends, SATA and power, including splitters.

Post new diagnostics after

  • Author

Sorry for the slow reply... checked connections and powered back on. The drive is visible and self-testing fine. I haven't started any rebuild yet.

Here is my updated diag: tdvault-diagnostics-20260203-2129.zip

  • Community Expert

Disk1 SMART looks fine, but there are some UDAM CRC errors. I would replace the SATA cables, and then, assuming the emulated disk is still mounting, rebuild on top.

  • Author

Hmm... okay. I'll order some new cables and replace these before I start the rebuild.

In the meantime, I'm trying to learn to read these diagnostics reports better myself. Looking at the Disk report files under the "smart" folder in the diagnostics, I'm seeing them mention the interface CRC errors that you're talking about, but are those recent errors since the last boot or are they lifetime errors on the drive.
I guess what I'm asking is whether there are new errors since I already replaced the data cables and powered it back on after being shut down... or whether these issues could exclusively be detected from back before I shut down the machine and replaced some cables. How are you telling what the specific error state is since my last power on?

  • Community Expert
1 hour ago, Yonder said:

but are those recent errors since the last boot or are they lifetime errors on the drive.

They are lifetime, unless you were monitoring them, it is difficult to know if they are old or recent. If notifications are enabled, you will get one if that attribute increases.

  • Community Expert

Acknowledge the current SMART warning (👎) by clicking on it on the DASHBOARD page, then

2 hours ago, JorgeB said:

you will get one if that attribute increases.

UDMA CRC count same in both diagnostics.

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