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2. 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:

3. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   Preferred compression algorithm is a combination of RLE and 12-bit LZW. Archives can be manipulated with the command-line NuLib tool, or the Windows-based CiderPress. .sit application/x-stuffit StuffIt: Originally Classic Mac OS, now multiple Originally Classic Mac OS, now multiple Yes A compression format common on Apple Macintosh computers ...

4. LZ77 and LZ78 - Wikipedia

   en.wikipedia.org/wiki/LZ77_and_LZ78

   To spot matches, the encoder must keep track of some amount of the most recent data, such as the last 2 KB, 4 KB, or 32 KB. The structure in which this data is held is called a sliding window, which is why LZ77 is sometimes called sliding-window compression. The encoder needs to keep this data to look for matches, and the decoder needs to keep ...

5. XZ Utils - Wikipedia

   en.wikipedia.org/wiki/XZ_Utils

   XZ Utils can compress and decompress the xz and lzma file formats. Since the LZMA format has been considered legacy, [2] XZ Utils by default compresses to xz. In most cases, xz achieves higher compression rates than alternatives like zip, [3] gzip and bzip2. Decompression speed is higher than bzip2, but lower than gzip.

6. RAR (file format) - Wikipedia

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

   Maximum compression dictionary size increased to 1 GB (default for WinRAR 5.x is 32 MB and 4 MB for WinRAR 4.x). Maximum path length for files in RAR and ZIP archives is increased up to 2048 characters. Support for Unicode file names stored in UTF-8 format. Faster compression and decompression. Multicore decompression support. Greatly improves ...

7. 7z - Wikipedia

   en.wikipedia.org/wiki/7z

   DEFLATE – Standard algorithm based on 32 kB LZ77 and Huffman coding. Deflate is found in several file formats including ZIP, gzip, PNG and PDF. 7-Zip contains a from-scratch DEFLATE encoder that frequently beats the de facto standard zlib version in compression size, but at the expense of CPU usage.