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File Spanning
{{Redir, Binary spanning, the mathematical optimization method, Binary splitting File spanning is the ability to package a single file or data stream into separate files of a specified size. This task implies the ability to re-combine the package files back into the original file or data stream. This is useful when saving large files onto smaller volumes or breaking large files up into smaller files for network messages of limited size (email, newsgroups). It also allows the creation of parity files such as parchive (PAR) to verify and restore missing or corrupted package files. Another advantage with this is coping with file size limits on some file systems of removable media, or coping with volume size limits of things like floppy disks. Sometimes the file spanning process is hidden as a secondary operation such as with file archivers. In this case, many smaller files are first packaged into a data stream and then repackaged into a multi-file archive. File spanning softwa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parity File
Parchive (a portmanteau of parity archive, and formally known as Parity Volume Set Specification) is an erasure code system that produces par files for checksum verification of data integrity, with the capability to perform data recovery operations that can repair or regenerate corrupted or missing data. Parchive was originally written to solve the problem of reliable file sharing on Usenet, but it can be used for protecting any kind of data from data corruption, disc rot, bit rot, and accidental or malicious damage. Despite the name, Parchive uses more advanced techniques (specifically error correction codes) than simplistic parity methods of error detection. As of 2014, PAR1 is obsolete, PAR2 is mature for widespread use, and PAR3 is a discontinued experimental version developed by MultiPar author Yutaka Sawada. The original SourceForge Parchive project has been inactive since April 30, 2015. A new PAR3 specification has been worked on since April 28, 2019 by PAR2 specifica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parchive
Parchive (a portmanteau of parity archive, and formally known as Parity Volume Set Specification) is an erasure code system that produces par files for checksum verification of data integrity, with the capability to perform data recovery operations that can repair or regenerate corrupted or missing data. Parchive was originally written to solve the problem of reliable file sharing on Usenet, but it can be used for protecting any kind of data from data corruption, disc rot, bit rot, and accidental or malicious damage. Despite the name, Parchive uses more advanced techniques (specifically error correction codes) than simplistic parity methods of error detection. As of 2014, PAR1 is obsolete, PAR2 is mature for widespread use, and PAR3 is a discontinued experimental version developed by MultiPar author Yutaka Sawada. The original SourceForge Parchive project has been inactive since April 30, 2015. A new PAR3 specification has been worked on since April 28, 2019 by PAR2 specificat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floppy Disks
A floppy disk or floppy diskette (casually referred to as a floppy, or a diskette) is an obsolescent type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined with a fabric that removes dust particles from the spinning disk. Floppy disks store digital data which can be read and written when the disk is inserted into a floppy disk drive (FDD) connected to or inside a computer or other device. The first floppy disks, invented and made by IBM, had a disk diameter of . Subsequently, the 5¼-inch and then the 3½-inch became a ubiquitous form of data storage and transfer into the first years of the 21st century. 3½-inch floppy disks can still be used with an external USB floppy disk drive. USB drives for 5¼-inch, 8-inch, and other-size floppy disks are rare to non-existent. Some individuals and organizations continue to use older equipment to read or transfer data from floppy disks. Floppy disks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
File Archivers
A file archiver is a computer program that combines a number of files together into one archive file, or a series of archive files, for easier transportation or storage. File archivers may employ lossless data compression in their archive formats to reduce the size of the archive. Basic archivers just take a list of files and concatenate their contents sequentially into archives. The archive files need to store metadata, at least the names and lengths of the original files, if proper reconstruction is possible. More advanced archivers store additional metadata, such as the original timestamps, file attributes or access control lists. The process of making an archive file is called ''archiving'' or ''packing''. Reconstructing the original files from the archive is termed ''unarchiving'', ''unpacking'' or ''extracting''. History An early archiver was the Multics command ''archive'', descended from the CTSS command of the same name, which was a basic archiver and performed no comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PKZip
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format. PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989. Since then versions have been released for a number of other architectures and operating systems. PKZIP was originally written by Phil Katz and marketed by his company PKWARE, Inc starting in 1986. The company bears his initials: 'PK'. History By the 1970s, file archiving programs were distributed as standard utilities with operating systems. They include the Unix utilities ar, shar, and tar. These utilities were designed to gather a number of separate files into a single archive file for easier copying and distribution. These archives could optionally be passed through a stream compressor utility, such as compress and others. Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WinZip
WinZip is a trialware file archiver and data compression, compressor for Microsoft Windows, macOS, iOS and Android (operating system), Android. It is developed by WinZip Computing (formerly Nico Mak Computing), which is owned by Corel, Corel Corporation. The program can create archives in ZIP (file format), Zip file format, unpack some other archive file formats and it also has various tools for system integration. Features * Support for .arc, ARC and ARJ archives if suitable external programs are installed. History WinZip 1.0 was released in April 1991 as a Graphical User Interface (GUI) front-end for PKZIP. From version 6.0 until version 9.0, registered users could download the newest versions of the software, enter their original registration information or install over the top of their existing registered version, and thereby obtain a free upgrade. This upgrade scheme was discontinued as of version 10.0. On May 2, 2006, WinZip Computing was acquired by Corel Corporatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RAR (file Format)
RAR is a proprietary format, proprietary archive file format that supports data compression, error correction and file spanning. It was developed in 1993 by Russian software engineer Eugene Roshal and the software is licensed by ''win.rar GmbH''. The name ''RAR'' stands for ''Roshal Archive''. File format The filename extensions used by RAR are .rar for the data volume set and .rev for the recovery volume set. Previous versions of RAR split large archives into several smaller files, creating a "multi-volume archive". Numbers were used in the file extensions of the smaller files to keep them in the proper sequence. The first file used the extension .rar, then .r00 for the second, and then .r01, .r02, etc. RAR compression applications and libraries (including GUI based WinRAR application for Windows, console rar utility for different OSes and others) are proprietary software, to which Alexander L. Roshal, the elder brother of Eugene Roshal, owns the copyright. Version 3 of RAR ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WinRAR
WinRAR is a trialware file archiver utility for Windows, developed by Eugene Roshal of win.rar GmbH. It can create and view archives in RAR (file format), RAR or Zip (file format), ZIP file formats, and unpack numerous archive file formats. To enable the user to test the integrity of archives, WinRAR embeds CRC32 or BLAKE2 checksums for each file in each archive. WinRAR supports creating Encryption, encrypted, multi-part and self-extracting archives. WinRAR is a Windows-only program. An Android (operating system), Android application called "RAR for Android" is also available. Related programs include the command-line utilities "RAR" and "UNRAR" and versions for macOS, Linux, FreeBSD, Windows CE, and MS-DOS. Evolution WinRAR and the RAR file format have evolved over time. Support for the archive format RAR5, using the same RAR file extension as earlier versions, was added in version 5.0; the older RAR file format has since been referred to as RAR4. WinRAR versions before 5.0 do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parchive
Parchive (a portmanteau of parity archive, and formally known as Parity Volume Set Specification) is an erasure code system that produces par files for checksum verification of data integrity, with the capability to perform data recovery operations that can repair or regenerate corrupted or missing data. Parchive was originally written to solve the problem of reliable file sharing on Usenet, but it can be used for protecting any kind of data from data corruption, disc rot, bit rot, and accidental or malicious damage. Despite the name, Parchive uses more advanced techniques (specifically error correction codes) than simplistic parity methods of error detection. As of 2014, PAR1 is obsolete, PAR2 is mature for widespread use, and PAR3 is a discontinued experimental version developed by MultiPar author Yutaka Sawada. The original SourceForge Parchive project has been inactive since April 30, 2015. A new PAR3 specification has been worked on since April 28, 2019 by PAR2 specificat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Split (Unix)
split is a utility on Unix, Plan 9, and Unix-like operating systems most commonly used to split a computer file into two or more smaller files. History The command first appeared in Version 3 Unix and is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification. The version of split bundled in GNU coreutils was written by Torbjorn Granlund and Richard Stallman. The command has also been ported to the IBM i operating system. Usage The command-syntax is: split PTION NPUT [PREFIX The default behavior of split is to generate output files of a fixed size, default 1000 lines. The files are named by appending ''aa'', ''ab'', ''ac'', etc. to ''output filename''. If ''output filename'' is not given, the default filename of ''x'' is used, for example, ''xaa'', ''xab'', etc. When a hyphen (''-'') is used instead of ''input filename'', data is derived from standard input. The files are typicall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
File Splitter
A demultiplexer for digital media files, or media demultiplexer, also called a file splitter by laymen or consumer software providers, is software that demultiplexes individual elementary streams of a media file, ''e.g.'', audio, video, or subtitles and sends them to their respective decoders for actual decoding. Media demultiplexers are not decoders themselves, but are format container handlers that separate media streams from a (container) file and supply them to their respective audio, video, or subtitles decoders. Notable file splitters * Microsoft AVI splitter - Part of Microsoft Windows. * Haali Media Splitter - demultiplexes MP4 ( MPEG-4), M2TS ( MPEG transport stream) and MKV (Matroska) files. * FLV Splitter - demultiplexes Flash video files. * Gabest Media Player Classic (MPC), Media Player Classic - Home Cinema (MPC-HC), and Media Player Classic - Black Edition (MPC-BE) are a family of free and open-source, compact, lightweight, and customizable media players for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
