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2. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Lossless compression of digitized data such as video, digitized film, and audio preserves all the information, but it does not generally achieve compression ratio much better than 2:1 because of the intrinsic entropy of the data. Compression algorithms which provide higher ratios either incur very large overheads or work only for specific data ...

3. Sloot Digital Coding System - Wikipedia

   en.wikipedia.org/wiki/Sloot_Digital_Coding_System

   The Sloot Digital Coding System is an alleged data sharing technique that its inventor claimed could store a complete digital movie file in 8 kilobytes of data — which, if true, would dramatically disprove Shannon's source coding theorem, a widely accepted principle of information theory that predicts how much data compression of a digital file is mathematically possible.

4. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   In information theory, data compression, source coding, [1] or bit-rate reduction is the process of encoding information using fewer bits than the original ...

5. ZIP (file format) - Wikipedia

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

   ZIP is an archive file format that supports lossless data compression.A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.

6. Executable compression - Wikipedia

   en.wikipedia.org/wiki/Executable_compression

   Executable compression is any means of compressing an executable file and combining the compressed data with decompression code into a single executable. When this compressed executable is executed, the decompression code recreates the original code from the compressed code before executing it.

7. Megabyte - Wikipedia

   en.wikipedia.org/wiki/Megabyte

   Depending on compression methods and file format, a megabyte of data can roughly be: a 1 megapixel bitmap image (e.g. ~1152 × 864) with 256 colors (8 bits/pixel color depth) stored without any compression. 6 seconds of 44.1 kHz/16 bit uncompressed CD audio. 1 minute of 128 kbit/s MP3 lossy compressed audio.

8. rzip - Wikipedia

   en.wikipedia.org/wiki/Rzip

   The second stage uses a standard compression algorithm to compress the output of the first stage. It is quite common these days to need to compress files that contain long distance redundancies. For example, when compressing a set of home directories several users might have copies of the same file, or of quite similar files.

9. gzip - Wikipedia

   en.wikipedia.org/wiki/Gzip

   gzip is a file format and a software application used for file compression and decompression.The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from which the "g" of gzip is derived).