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  2. 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.

  3. ZPAQ - Wikipedia

    en.wikipedia.org/wiki/ZPAQ

    On update, ZPAQ divides the input files into fragments, computes their SHA-1 hashes, and compares them to the hashes stored in the archive. If there is a match, then the fragments are assumed to be identical, and only a pointer to the previously compressed fragment is stored.

  4. 7-Zip - Wikipedia

    en.wikipedia.org/wiki/7-Zip

    The file manager, by default, displays hidden files because it does not follow Windows Explorer's policies. The tabs show name, modification time, original and compressed sizes, attributes, and comments (4DOS descript.ion format). When going up one directory on the root, all drives, removable or internal appear.

  5. List of archive formats - Wikipedia

    en.wikipedia.org/wiki/List_of_archive_formats

    This means that compressed archives with the UC2 file extension can hold almost 1 million files. .uca PerfectCompress [17] Windows: Windows: No Based on PAQ, RZM, CSC, CCM, and 7zip. The format consists of a PAQ, RZM, CSC, or CCM compressed file and a manifest with compression settings stored in a 7z archive. .uha UHarc DOS/Windows: DOS/Windows ...

  6. XZ Utils - Wikipedia

    en.wikipedia.org/wiki/XZ_Utils

    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. Compression can be much slower than gzip, and is slower than bzip2 for high levels of compression, and is most useful when a compressed file will be used many times. [4] [5]

  7. Disk compression - Wikipedia

    en.wikipedia.org/wiki/Disk_compression

    A disk compression software utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility, which compresses only specified files—and which requires the user to designate the files to be compressed—an on-the-fly disk compression utility works automatically through resident software without the user needing to be aware of ...

  8. Executable compression - Wikipedia

    en.wikipedia.org/wiki/Executable_compression

    Executable compression used to be more popular when computers were limited to the storage capacity of floppy disks, which were both slow and low capacity media, and small hard drives; it allowed the computer to store more software in the same amount of space, without the inconvenience of having to manually unpack an archive file every time the ...

  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:

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