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Of the most popular compression methods (7z, RAR, Zip, GZip) is there any of them that allows to retrieve the uncompressed data from a partial file?

Imagine there is only one compressed file, and it is a plain text log. Would I be able to read some of the log if the compressed file wasn't written to the end?

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Yes its possible. If the file is not complete you cannot extract the file from the archive. In order to recover a partial archive Par2 files must exist for the archive. en.wikipedia.org/wiki/PAR2 –  Ramhound Sep 10 '12 at 14:18
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try it diskinternals.com/zip-repair –  Lamb Sep 10 '12 at 15:05

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