Also I got two other warnings:

Warning [SMG-NAS] - udma crc error count is 2

WDC_WD80EFZZ-68BTXN0_WD-CA144PXK (dev3) (which is the parity drive)

My plan would be to add a new parity drive, but I'm asking first.

I was in the middle of a large copy from a remotely mounted windows share, which I have stopped.

Diagnostics attached.

The parity disk is disabled and will not spin up. I am not able to run extended diagnostics.

....Steve

smg-nas-diagnostics-20260509-1746.zip

Edited May 9May 9 by StevieGee
new information

UDMA_CRC_Error_Count is a connection problem not a disk problem.

The disk that was Parity disconnected and reconnected as an Unassigned Device. You would have to do the SMART extended self-test on the Unassigned Device. But SMART for that disk looks OK, it has recently passed an extended test, and syslog seems to indicate a connection problem instead of a disk problem.

Just check your connections and rebuild parity to the same disk.

https://docs.unraid.net/unraid-os/using-unraid-to/manage-storage/array/replacing-disks-in-array/#re-enabling-a-disabled-disk-rebuilding-onto-itself

After you get it reassigned as parity and rebuilding, you can click the SMART warning (👎) for that disk on the DASHBOARD page and Acknowledge, then it won't warn again unless it increases.

@trurl

I checked connections and rebuilt parity to the same disk. Now, a week later, the same error. Should I rebuild parity on the same disk again? I have a Ting electrical monitoring device (a recent add) and no power burps or brown outs. I have attached diagnostics and checked connections again. Also, I did upgrade to 7.2.5 last week.

Thank you for your help.

...Steve

smg-nas-diagnostics-20260518-1151.zip

Edited May 18May 18 by StevieGee

Replace SATA cable.

How is this drive connected to power? Any splitters?

@trurl

Well, I replaced all the SATA cables, ran a diagnostic (attached), and re-enabled the disabled disk and started the parity rebuild. It seems to take about 3 days since parity building starts and stops from heat per the settings I've put in. I'll post another diagnostic once parity finishes. Thank you.

...Steve

smg-nas-diagnostics-20260521-1557.zip