tar stops reading when it encounters a block of zeros
between file entries (which usually indicates the end of the archive).
--ignore-zeros (-i) allows
tar to completely read an archive
which contains a block of zeros before the end (i.e. a damaged
archive, or one which was created by
cat-ing several archives
The --ignore-zeros (-i) option is turned off by default because many
tar write garbage after the end-of-archive entry,
since that part of the media is never supposed to be read. GNU
tar does not write after the end of an archive, but seeks to
maintain compatablity among archiving utilities.
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