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leons

macrumors 6502a
Apr 22, 2009
662
344
I hope so. Do you have a link/reference for the write endurance spec, or testing, on Apple SSDs?
There have been numerous reports of M1 macs displaying a SMART % used. These extrapolate to about 1600TBW for a 256GB drive (which equate to 3200TBW for a 256GB drive, 6400TBW for a 1TB drive). Some have questioned these numbers (too high?), but even taking them at 50% gives you no worries in all but the most "off the record" cases.
 

Reason077

macrumors 68040
Aug 14, 2007
3,854
4,092
There have been numerous reports of M1 macs displaying a SMART % used. These extrapolate to about 1600TBW for a 256GB drive (which equate to 3200TBW for a 256GB drive, 6400TBW for a 1TB drive). Some have questioned these numbers (too high?), but even taking them at 50% gives you no worries in all but the most "off the record" cases.

Yeah. I'm just not sure how linear the "percentage used" actually is. From what I can recall, my MacBook Pro said 0% or 1% used for the longest time, then seemed to quite quickly go up to 15% within a few months. It's SSD also seems a bit slower than it used to be, or at least, less consistent in speed. And this is after "only" 119 TBW.
 

jdb8167

macrumors 601
Nov 17, 2008
4,859
4,599
Yeah. I'm just not sure how linear the "percentage used" actually is. From what I can recall, my MacBook Pro said 0% or 1% used for the longest time, then seemed to quite quickly go up to 15% within a few months. It's SSD also seems a bit slower than it used to be, or at least, less consistent in speed. And this is after "only" 119 TBW.
Aging SSDs can definitely slow down. Write Amplification can affect performance as well as endurance.

The NVMe spec just says that Percentage Used is a vendor specified estimate. It doesn't require it be linear or not linear. The vendor should also specify the TBW specification so that the user has a way of predicting drive longevity but since Apple doesn't provide that, all we can do is extrapolate from the % Used number and estimate the TBW value. Apple hasn't given us any other choice.
 
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