Pre-Clear and S.M.A.R.T issues on drives

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Hey there,

I have been using Unraid for about a month now having had one 6tb drive, a 6tb parity and a small SSD cache drive.

I was looking to add another couple of my old WD my books to my array to get more storage, however I have run into issues with both drives on pre-clear and S.M.A.R.T, but these drives were working fine on Windows machine before hand and when I plug them into my windows machine, format them and look at S.M.A.R.T on there, they appear fine.

I have tried swapping the sata cables, power cables, sata slots and still the same issues.

One of the drives failed on a post-read initially, but cleared fine, so i added it to the array and then found S.M.A.R.T issues, so i took it out of the array and ran pre-clear again, however this time it failed on the pre-read. I have attached an image to this thread, to see if anyone can make sense of the errors. I have also attached the S.M.A.R.T diagnostics for this drive, which again makes no sense to me and i am hoping someone can help me.

I haven';t got the diagnostics for the other drive, as I have been changing things so much to figure out whats going on, but still no results.

Could someone please help? 


Screen Shot 2019-06-21 at 06.42.08.png


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197 Current_Pending_Sector  -O--CK   200   200   000    -    1
  1 Raw_Read_Error_Rate     POSR-K   200   200   051    -    5

My understanding is that Raw Rear Error Rate should be ideally 0 on WD drives.


On the pending sector, while I have no problems with an error or 2 on drives, I do have an issue with them on a drive that only has 75 hours on it.

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