This is my first NAS build, which has been running well for a few months, and tonight, it suddenly shows "Device is Disabled, Contents Emulated" for disk 1 (I only have one data disk and one parity disk).

I downloaded the SMART report and found "0x06 0x008 4 51 --- Number of Hardware Resets"

I'm not familiar with this, but ChatGPT suggested that this might be the source of the issue.

This is my SMART reportWDC_WD80EFPX-68C4ZN0_WD-RD263H6H-20250907-2214.txt

I wonder what I can do to find the actual issue?

p.s. I also found my parity disk has 49 --- Number of Hardware Resets as well.

Edited September 7, 2025Sep 7 by Yif

Attach Diagnostics ZIP to your NEXT post in this thread.

Diagnostics files: coolbox-diagnostics-20250908-0917.zip

Diags are after rebooting, so we can't see what happened, but SMART looks fine, check/repalce both cables to rule that out and rebuild on top, if it happens again, grab the diags before rebooting.

https://docs.unraid.net/unraid-os/manual/storage-management#rebuilding-a-drive-onto-itself

I reproduced the issue. It seems to be related to rclone, which I recently installed.

After rebuilding the array, I found my CPU usage was stuck at 40%, so I did some investigation.

It was the rclone container that was stuck at rclone config

I use a user script to sync files from Google Drive daily, so I tried the command from the rclone container to see if it's working. It seems to work well, but after that, I saw the disk read error again.

My rclone config

coolbox-diagnostics-20250909-1026.zip

My diagnostics before restart or rebuild

Apps should never cause actual read errors. The disk dropped offline:

Sep 9 05:49:21 CoolBox kernel: ata7: link is slow to respond, please be patient (ready=0)

### [PREVIOUS LINE REPEATED 2 TIMES] ###

Sep 9 05:50:11 CoolBox kernel: ata7: limiting SATA link speed to 3.0 Gbps

Sep 9 05:50:16 CoolBox kernel: ata7: hardreset failed

Sep 9 05:50:16 CoolBox kernel: ata7: reset failed, giving up

Sep 9 05:50:16 CoolBox kernel: ata7.00: disable device

This is typicalçly a power/connection issue.

27 minutes ago, JorgeB said:

Apps should never cause actual read errors. The disk dropped offline:

Sep 9 05:49:21 CoolBox kernel: ata7: link is slow to respond, please be patient (ready=0)

### [PREVIOUS LINE REPEATED 2 TIMES] ###

Sep 9 05:50:11 CoolBox kernel: ata7: limiting SATA link speed to 3.0 Gbps

Sep 9 05:50:16 CoolBox kernel: ata7: hardreset failed

Sep 9 05:50:16 CoolBox kernel: ata7: reset failed, giving up

Sep 9 05:50:16 CoolBox kernel: ata7.00: disable device

This is typicalçly a power/connection issue.

Thanks for checking. Is it possible to know if it's the sata or power?

Recommend replacing both