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How much data is on the disk you want to format? How much data are you trying to save? How big is the "spare" disk that you have where you want to store the data while formatting?– yosh mCommented Apr 17, 2014 at 7:19
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1There is no such thing as a predictable compression ratio. Deal with it.– Daniel BCommented Apr 17, 2014 at 7:29
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@yoshm I want to format full disk. The question is that I have X Gb of data I want to know how large "spare" disk I need to backup it.– mrgloomCommented Apr 17, 2014 at 7:31
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@DanielB why not? What if algorithm pass through data and calc size of resulting archive?If it needed for "dictionary"(or something) it may use some "buffer" on disk which size is previously predifined and deleted after calculation.– mrgloomCommented Apr 17, 2014 at 7:36
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1Because this is how compression works. You cannot tell the size until you go through the file and try to compress it.– ek9Commented Apr 17, 2014 at 7:40
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