Salvo Tomaselli wrote:

>> Or, it should get clever and not unpack everything. There are plenty of
>> software that are able to read into archives without extracting from
>> them. 
> You can't do it for a .tar.gz or a .tar.bz and they are the most common kind 
> of archive.

xz compression format supports dividing files into blocks that are seekable
http://www.tukaani.org/xz/format.html

tar format itself has limitations, here is some planning of new format
http://duplicity.nongnu.org/new_format.html


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