> This is a terrible assumption in general (i.e. if filesize % blocksize
> is close to uniformly distributed). If you remove one byte and the data
> is stored with blocksize B, then you either save zero bytes with
> probability 1-1/B or you save B bytes with probability 1/B. The
> expected number of bytes saved is B*1/B=1. Since expectation is linear,
> if you remove x bytes, the expected number of bytes saved is x (even if
> there is more than one byte removed per file).
You didn't calculate the probability of actually saving a full block
or not (that's the only thing that matters). I assumed it's relatively
small and can be ignored in practice since the amount of end white
space is negligible compared to total file size.
-Andi
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