I recently received an error that disk1 has been disabled, and has read errors. Looking at the SMART logs there are no read errors or reallocated sectors, but "199 UDMA_CRC_Error_Count" was at 19. After running a SMART test and not seeing anything (I think) that shows the drive is failing and looking around the forum my current understanding is this is a data or power cable issue. I used a different data cable, and tried to unassign, start the array, stop, then assign to rebuild the drive. When the array finally starts the drive is still disabled and nothing is being rebuilt and I believe the same error is popping up, but new since the CRC error count has increased. My questions are

1) Am I missing something or is the above assessment correct?

2) Since I changed the data cable, and the same problem persists, does this mean I need to look into it being a power issue?

As a side note, I have a splitter cable power all the hard drives. If it's a power issue with one drive would it not affect the other drives?

I'm currently not sure how to proceed, and am not an expert at reading the diagnostics and haven't learned much more about the UDMA CRC error count than what I've already mentioned.

Any help would be greatly appreciated! Thanks!

towerbackup-diagnostics-20260122-1614.zip towerbackup-diagnostics-20260123-2057.zip

54 minutes ago, barrysagittarius said:

I have a splitter cable power all the hard drives.

You don't have many drives, but too many for a single PSU cable. Why are you trying to do it that way?

You don't have many drives, but too many for a single PSU cable. Why are you trying to do it that way?

Well, the short response would be ignorance. I tried to look this up and found the following. The 650W PSU I have has the following specs
+3.3V@20A, +5V@20A, +12V@54A, [email protected], [email protected]

From this post I'm under the impressions that the +12V@54A is the power I have for all of the hard drives which seems like it should be enough. Should my next step be a different PSU cable setup? the documentation says I have

SATA/PERIF: 1 x SATA 5-Pin x 4, 1 x SATA 5-Pin x 2, 1 x Molex 4-Pin x 4

You don't have many drives, but too many for a single PSU cable. Why are you trying to do it that way?

Well, a few updates. I checked and I had 2 PSU cables. So the answer to your question is "pure ignorance" on my part.

Since then I was able to run an extended SMART test without problems. However, after replacing the power cable for the previously faulty drive, I powered on the server and now 2 different hard drives were missing. I powered it off, replaced the other PSU cable, looked to make sure nothing was loose or out of place and now having powered it on and off, all hard drives are missing. So my new questions are

1) Would this be the PSU if 2 brand changing the cables didn't improve anything/no pattern for missing hard drive to new cable. If the whole PSU is failing shouldn't the computer not load up?

2) I have SATA data cables for 2 drives to the motherboard, and for to an LSI. There is no pattern here as well.

So why would all the drives show up as missing now with no other changes? Here's one more diagnostics file from today if it helps.

Thanks!

towerbackup-diagnostics-20260125-2130.zip

Are you using modular PSU cables that did not come with that PSU? There is no standard pinout for modular PSUs. Using modular PSU cables that weren't supplied with the PSU has fried many disks.