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Any ideas on why the drive might be starting on sector 13? It is still doing the pre-clear but if there is anything else I will post that too.

Hey Trurl, I successfully rebuilt to the replacement drive Such a relief to have it all safe again. Thank you! Im now in the process of pre-clearing the 'failed' drive and noticed something strange in the log. Why would a drive start in sector 13? I am also curious why my drives always slowdown as they get further into the pre-read cycle?

They are all on the same power cable so maybe, but I havent reseated the power for the drives that didnt fail and they are coming online. Where in the diagnostics can I see the connection problems?

I did actually think to grab one at the time. Here it is. tower-diagnostics-20220111-1654.zip

Thanks trurl, I started the array and attached a fresh diagnostic report. Is there any way to figure out what caused the error in the first place? Just feel a bit blind on what I can be doing to improve things going forward. tower-diagnostics-20220112-1405.zip

Hi Guys, I had a drive report an error state and it was disabled. I tried to run an extended SMART but it failed several times with "Interrupted (host reset)" but then completed without error overnight. It did take a few hours longer than another drive I ran an extended test on recently so not sure. Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 377 - # 2 Extended offline Interrupted (host reset) 90% 362 - # 3 Extended offline Interrupted (host reset) 90% 361 - # 4 Extended offline Interrupted (host reset) 90% 360 - # 5 Extended offline Interrupted (host reset) 90% 360 - # 6 Short offline Completed without error 00% 360 - I have attached the Extended diagnostics for the drive and the diagnostics. tower-smart-20220112-1117.ziptower-diagnostics-20220112-1153.zip I am currently pre-clearing a spare drive to replace this one incase it needs to be replaced - some other forum answers suggest that I should replace the "failed" drive regardless and run a preclear on it to be sure (once the array has been rebuild). Is this the recommended practice? Any help understanding the SMART report would be great. Thanks!