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Solid compression

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In computing, solid compression refers to a method for data compression of multiple files, wherein all the compressed files are treated as a single data block. It is used in the 7z and RAR formats, as well as in tar-based formats such as .tar.gz and .tar.bz2.

Solid compression allows for much better compression rates when all the files are similar, which is often the case if they are of the same file format. On the other hand, getting a single file out of a solid archive requires processing all the files before it, so modifying solid archives can be slow and inconvenient.

The ubiquitous ZIP format does not support solid compression.

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