A couple of my disk keep having high "UDMA CRC error count" but I do a smart error report and it says all is good. What might be the issue?

 

Also my format button is greyed out. What might be the issue on that?

 

Thank you for the help.

WDC_WD4000FYYZ-01UL1B2_WD-WMC130D6Y6C2-20180823-1452.txt

WDC_WD40EFRX-68WT0N0_WD-WCC4E1992613-20180824-0425.txt

WDC_WD40EFRX-68WT0N0_WD-WCC4EK8ZSH81-20180824-0425.txt

Check your cables and enable destructive mode in Settings -> Unassigned Devices.

Sorry, I didn't actually answer your first question. UDMA CRC errors are communication errors between the SATA controller and the drive electronics, usually caused by poor cables or backplanes, or less commonly by a bad controller. So it isn't really a drive problem at all.

@John_M thank you for your help. I got the format issue solved with your answer.

Problem still is I tried connecting the drives straight to the mobo instead of the raid card. and still had the same issues.

 

What is the possibility that it is a power issue?

 

Although something that is making me wonder is I keep having notifications saysing udma crc error count returned to normal value. 

No warnings saying they have gone out of normal value.

Edited August 27, 20187 yr by demonmaestro

16 minutes ago, demonmaestro said:

Although something that is making me wonder is I keep having notifications saysing udma crc error count returned to normal value.

This doesn't make much sense - the UDMA CRC errors will just keep incrementing. They never gets reset back to zero. What is the exact text you see in the notifications?

I think what it is doing is reassigning the drive letter to a different drive due to it not being apart of the array as of yet. It just sees ex: sdj is now zero.

 

anyways problem still comes up though I tried connecting the drives straight to the mobo instead of the raid card. and still had the same issues

Edited August 27, 20187 yr by demonmaestro

7 hours ago, demonmaestro said:

What is the possibility that it is a power issue?

 

Yes, it's possible. Power supplies can cause all kinds of strange faults. If you're in doubt replace it - remember, the power supply isn't particularly exciting but it's the foundation for your system. Are you using a lot of power splitters? You really don't want more than three or four disks on each cable from the power supply. Another source of UDMA errors is crosstalk between SATA cables that are neatly laced together and parallel for most of their length. It's best to cut the ties and let them spread out a bit.

 

As pwm says, UDMA error counts are never reset - they just increase, but if the part of the GUI that keeps track of them refers to them by drive letter then that would explain what you're seeing. Odd though, because unRAID itself keeps track of disks by their serial number for the very reason that the letters can be re-ordered after a hardware change.