February 13, 201610 yr sorry for the sensational title, however i can't explain this? earlier in the week, got a few warning emails, that i had a pending sector count of 1, then 3, then 5. here's the email i got: Event: unRAID device sdc SMART health [197] Subject: Warning [CHIMERA] - current pending sector is 5 Description: WDC_WD20EARS-00MVWB0_WD-WMAZA0823880 (sdc) Importance: warning later in the week got this: Event: unRAID device sdc SMART message [197] Subject: Notice [CHIMERA] - current pending sector returned to normal value Description: WDC_WD20EARS-00MVWB0_WD-WMAZA0823880 (sdc) Importance: normal i assumed the pending were reallocated so i copied everything off the disk, then ran a pre clear which came up totally normal! and the preclear doesn't show any sectors reallocated? Am i missing something? was unraid mistaken, or are the smart reports coming from the disk screwed up (ie report pending, and then not) preclear finish report attached i'm quite tempted to put the drive back in the array as it looks normal.... preclear_finish_WD-WMAZA0823880_2016-02-13.zip
February 13, 201610 yr A pending sector is from when a read is unreliable, but reallocation only happens if a write fails. It is possible for a pending sector to clear itself if the next write to it succeeds and at that point the data can read reliably. Often after doing that the drive will perform perfectly but you should still keep an eye on such drives to check that more pending sectors do not start appearing which could be a sign of problems in the future.
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