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-boption is equivalent to--apparent-size --block-size=1and that would output the logical, not physical, size. You don't want--apparent-sizebut just--block-size=1.physicalSize < logicalSizeinstead of checking whether the quotient is smaller than one? And keep in mind that this only works if someone has written data to a large position, i.e. there are actual gaps in the file, whilst a file not having gaps or even being empty still can be marked as “sparse”.