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The re-encoding of a file or data into a form that uses fewer bits of information than the original data.

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Could a 163-bytes size difference between the tgz of two different 590mb dirs be caused just...

I am comparing 10+ MRI datasets that have been stored in a variety of compression formats in local and cloud drives for 10+ years. I'm sure some are duplicates. … tar cfa mri01.tgz MRI01 tar cfa mri02.tgz MRI02 For datasets that are, before tgz compression, typically about 615-mb with about 135 files, I sometimes see no size difference, a size difference of only …
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