Subj : Re: Preventative Wear Leveling
To   : poindexter FORTRAN
From : MeaTLoTioN
Date : Sat Aug 23 2025 18:51:54

On 17 Aug 2025, poindexter FORTRAN said the following...
 
 pF> My Synology NAS has made an annoying clunk every 5 seconds, associated
 pF> with all of the drive activity lights flickering. I thought cache writes
 pF> were causing it, but after disabling write caching, it still happens.
 pF> 
 pF> Doing some research, it sounds like WD drives and some other brands to
 pF> something called PWL, or preventative wear leveling.
 pF> 
 pF> Apparently, when the drives are idle, the firmware moves the head across
 pF> the disk to keep the lubrication spread and avoid a stiction issue.
 pF> 
 pF> That's an admirable effort, but every 5 seconds? Come on...

If it's every 5 seconds I would say that's less likely PWL and more likely that one (or more) of the disks has developed a bad sector/block and the heads are retrying to read and reread said sector/block, I don't think PWL would be initiated every 5 seconds, would it?

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