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Personally, I think disk defragmenters are evil ;-) They
create the need that they are supposed to satisfy at the
same time. On Linux we have no defragmenters, so we don't
bother about it.

I think your proposal is some kind of a performance hack for
a particular filesystem. In principle, this problem exists
for all filesystems on all platforms. Fragmentation is IMO a
filesystem's problem and is not so much a state but more
like a process. Filesystem fragment over time and you can't
do anything about it. For those people who care, disk
fragmenter were invented. It is not tarfile.py's job to care
about a fragmented filesystem, that's simply too low level.

I admit that it is a small patch, but I'm -1 on having this
applied.