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2. Solid compression - Wikipedia

   en.wikipedia.org/wiki/Solid_compression

   In computing, solid compression is a method for data compression of multiple files, wherein all the uncompressed files are concatenated and treated as a single data block. Such an archive is called a solid archive. It is used natively in the 7z [1] and RAR [2] formats, as well as indirectly in tar-based formats such as .tar.gz and .tar.bz2.

3. RAR (file format) - Wikipedia

   en.wikipedia.org/wiki/RAR_(file_format)

   UNRARLIB (UniquE RAR File Library) [19] was an obsolete free software unarchiving library called "unrarlib", licensed under the GPLv2-or-later. It could only decompress archives created by RAR versions prior to 2.9; archives created by RAR 2.9 and later use different formats not supported by this library.

4. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   Compression format(s) used by some DOS and Windows install programs. MS-DOS includes expand.exe to decompress its install files. The compressed files are created with a matching compress.exe command. The compression algorithm is LZSS.

5. 7-Zip - Wikipedia

   en.wikipedia.org/wiki/7-Zip

   7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives".It is developed by Igor Pavlov and was first released in 1999.

6. Comparison of file archivers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_file_archivers

   The operating systems the archivers can run on without emulation or compatibility layer. Ubuntu's own GUI Archive manager, for example, can open and create many archive formats (including Rar archives) even to the extent of splitting into parts and encryption and ability to be read by the native program.

7. PeaZip - Wikipedia

   en.wikipedia.org/wiki/PeaZip

   Eugene Roshal unrar (royalty-free license from RarLab/Win.Rar GmbH, source available but subject to restrictions to prevent creating a rar compressor); being released under a non-OSI compliant license it is available as a separate free-of-charge) package on PeaZip Add-ons page, as PeaZip UNRAR5 Plugin.

8. zstd - Wikipedia

   en.wikipedia.org/wiki/Zstd

   Arch uses zstd -c -T0 --ultra -20 -; the size of all compressed packages combined increased by 0.8% (compared to xz), the decompression speed is 14 times faster, decompression memory increased by 50 MiB when using multiple threads, and compression memory increased but scales with the number of threads used.

9. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes: