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post #31 of 33

I'd guess you're talking about their PWL (Pre-emptive wear levelling) system?  I believe (but I haven't seen much about it nor investigated too much myself) that all WDC's PWL system does is periodically perform one or more full strokes, in order to prevent the armature sticking in one place if the bulk of the disk operations are taking place in a few of the tracks on a drive.

 

I can kinda see the point, but to be honest I can't really see it being a huge benefit in practice.  And it's all but irrelevant (IMO) for 'normal' consumer NASes, OS drives etc.  An enterprise application where very little data is actually written on a drive compared to its capacity (ie high spindle count applications) could also benefit, and maybe some CCTV systems.  But all in all not that useful.

 

Now I could be wrong - I haven't seen a whitepaper on the technology so I may be barking up the wrong tree entirely... :)

post #32 of 33
Thread Starter 
@the_beast

Cheers for that. smile.gif
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post #33 of 33
Quote:
Originally Posted by parityboy View Post

@DuckieHo

So the cell damage would affect writes first? Also, is there an (at least vague) rule of thumb you can use to replace an SSD, if you can't get the needed info from it? Will the SMART spec be extended to include SSD features?

Cell damage is ONLY due to writes.

Consumer NAND is required to be readable up to 12 months after no longer being writable.
Enterprise NAND is required to be readable up to 3 (or was it 1) months after no longer being writable.
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