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Joined 1 year ago
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Cake day: June 19th, 2023

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  • Huh? What does how a drive size is measured affect the available address space used at all? Drives are broken up into blocks, and each block is addressable.

    Sorry, I probably wasn’t clear. You’re right that the units don’t affect how the address space is used. My peeve is that because of marketing targeting nice round numbers, you end up with (for example) a 250GB drive that does not use the full address space available (since you necessarily have to address to up 256GiB). If the units had been consistent from the get-go, then I suspect the average drive would have just a bit more usable space available by default.

    My comment re wear-levelling was more to suggest that I didn’t think the unused address space (in my example of 250GB vs 256GiB) could be excused by saying it was taken up by spare sectors.


  • Of course. The thing is, though, that if the units had been consistent to begin with, there wouldn’t be anywhere near as much confusion. Most people would just accept MiB, GiB, etc. as the units on their storage devices. People already accept weird values for DVDs (~4.37GiB / 4.7GB), so if we had to use SI units then a 256GiB drive could be marketed as a ~275GB drive (obviously with the non-rounded value in the fine print, e.g. “Usable space approx. 274.8GB”).