(gzip.info)Tapes

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6 Using ‘gzip’ on tapes
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When writing compressed data to a tape, it is generally necessary to pad
the output with zeroes up to a block boundary.  When the data is read
and the whole block is passed to ‘gunzip’ for decompression, ‘gunzip’
detects that there is extra trailing garbage after the compressed data
and emits a warning by default if the garbage contains nonzero bytes.
You can use the ‘--quiet’ option to suppress the warning.