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Universal Disk Image Format
Apple Disk Image is a disk image format commonly used by the macOS operating system. When opened, an Apple Disk Image is mounted as a volume within the Finder. An Apple Disk Image can be structured according to one of several proprietary disk image formats, including the Universal Disk Image Format (UDIF) from Mac OS X and the New Disk Image Format (NDIF) from Mac OS 9. An Apple disk image file's name usually has ".dmg" as its extension. A disk image is a compressed copy of the contents of a disk or folder. To see the contents of a disk image, one must first open the disk image so it appears on the desktop or in a Finder window. Features Apple Disk Image files are published with a MIME type of ''application/x-apple-diskimage''. Different file systems can be contained inside these disk images, and there is also support for creating hybrid optical media images that contain multiple file systems. Some of the file systems supported include Hierarchical File System (HFS), HFS P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mac OS X Disk Image
Mac or MAC may refer to: Common meanings * Mac (computer), a line of personal computers made by Apple Inc. * Mackintosh, a raincoat made of rubberized cloth * Mac, a prefix to surnames derived from Gaelic languages * McIntosh (apple), a Canadian apple cultivar Arts and entertainment Fictional entities * Mac (''Green Wing''), a television character * Mac (''It's Always Sunny in Philadelphia''), a television character * Mac Gargan, an enemy of Spider-Man * Mac, a character on ''Foster's Home for Imaginary Friends'' * Angus "Mac" MacGyver, from the television series ''MacGyver'' * Cindy "Mac" Mackenzie, from the TV series ''Veronica Mars'' * Lt. Col. Sarah MacKenzie, from the TV series ''JAG'' * Dr. Terrence McAfferty, from Robert Muchamore's ''CHERUB'' and ''Henderson's Boys'' novel series * Mac McAnnally, in ''The Dresden Files'' series * Randle McMurphy, in the movie ''One Flew Over the Cuckoo's Nest'' * Mac Taylor, from the TV series ''CSI: NY'' * Mac, a canine chara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Disk Format
Universal Disk Format (UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660. Due to its design, it is very well suited to incremental updates on both write-once and re-writable optical media. UDF was developed and maintained by the Optical Storage Technology Association (OSTA). In engineering terms, Universal Disk Format is a profile of the specifications known as ISO/IEC 13346 and ECMA-167. Usage Normally, authoring software will master a UDF file system in a batch process and write it to optical media in a single pass. But when packet writing to rewritable media, such as CD-RW, UDF allows files to be created, deleted and changed on-disc just as a general-purpose filesystem would on removable media like floppy disks and flash drives. This is also possible on write-once media, such as CD-R, but in that case the space occu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bzip2
bzip2 is a free and open-source file compression program that uses the Burrows–Wheeler algorithm. It only compresses single files and is not a file archiver. It relies on separate external utilities such as tar for tasks such as handling multiple files, and other tools for encryption, and archive splitting. bzip2 was initially released in 1996 by Julian Seward. It compresses most files more effectively than older LZW and Deflate compression algorithms but is slower. bzip2 is particularly efficient for text data, and decompression is relatively fast. The algorithm uses several layers of compression techniques, such as run-length encoding (RLE), Burrows–Wheeler transform (BWT), move-to-front transform (MTF), and Huffman coding. bzip2 compresses data in blocks between 100 and 900 kB and uses the Burrows–Wheeler transform to convert frequently recurring character sequences into strings of identical letters. The move-to-front transform and Huffman coding are then ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zlib
zlib ( or "zeta-lib", ) is a software library used for data compression as well as a data format. zlib was written by Jean-loup Gailly and Mark Adler and is an abstraction of the DEFLATE compression algorithm used in their gzip file compression program. zlib is also a crucial component of many software platforms, including Linux, macOS, and iOS. It has also been used in gaming consoles such as the PlayStation 4, PlayStation 3, Wii U, Wii, Xbox One and Xbox 360. The first public version of Zlib, 0.9, was released on 1 May 1995 and was originally intended for use with the libpng image library. It is free software, distributed under the zlib License. Capabilities Encapsulation Raw DEFLATE compressed data (RFC 1951) are typically written with a zlib or gzip wrapper encapsulating the data, by adding a header and footer. This provides stream identification and error detection that are not provided by the raw DEFLATE data. The zlib wrapper (RFC 1950) is smaller than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FileVault
FileVault is a disk encryption program in Mac OS X 10.3 Panther (2003) and later. It performs on-the-fly encryption with volumes on Mac computers. Versions and key features FileVault was introduced with Mac OS X 10.3 Panther, and could only be applied to a user's home directory, not the startup volume. The operating system uses an encrypted sparse disk image (a large single file) to present a volume for the home directory. Mac OS X 10.5 Leopard and Mac OS X 10.6 Snow Leopard use more modern sparse bundle disk images which spread the data over 8 MB files (called ''bands'') within a bundle. Apple refers to this original iteration of FileVault as "legacy FileVault". OS X 10.7 Lion and newer versions offer FileVault 2, which is a significant redesign. This encrypts the entire OS X startup volume and typically includes the home directory, abandoning the disk image approach. For this approach to disk encryption, authorised users' information is loaded from a separate non-e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spoonerism
A spoonerism is an occurrence of speech in which corresponding consonants, vowels, or morphemes are switched (see metathesis) between two words of a phrase. These are named after the Oxford don and priest William Archibald Spooner, who reportedly commonly spoke in this way. Examples include saying "blushing crow" instead of "crushing blow", or "runny babbit" instead of "bunny rabbit". While spoonerisms are commonly heard as slips of the tongue, they can also be used intentionally as a word play. The first known spoonerisms were published by the 16th-century author François Rabelais and termed . In his novel '' Pantagruel'', he wrote ("insane woman at Mass, woman with flabby buttocks"). Etymology Spoonerisms are named for the Reverend William Archibald Spooner (1844–1930), Warden from 1903 to 1924 of New College, Oxford, who was allegedly susceptible to this mistake. The ''Oxford English Dictionary'' records the word ''spoonerism'' as early as 1900. The term was well-es ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Native Format
A native format, in the context of software applications, refers to the file format A file format is a Computer standard, standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary format, pr ... which the application is designed to work with. It captures the internal reality of the program as well as is possible. Most likely this is also the default format of the application. A native file format therefore most likely has a one to one relationship with the applications features. In turn, a foreign format is not a true reflection of application internals, even though it may be supported by an application. To read a foreign file causes translation of data, this can cause data loss and further editing may prevent faithful writing back to the foreign format. Example A document writer application may support a multitude of files, ranging from sim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IMG (file Format)
An IMG file, a.k.a. raw image, contains a complete and uncompressed image of a storage device's data content. The image includes the value of each memory location of the storage device, ordered sequentially such that the data can be written to a similar device to completely overwrite its content. The layout of data in a raw image depends on the file system of the target storage device (for example FAT). For example, an optical disc (i.e. CD or DVD) raw image contains the tracks of audio or video. In the case of a CD-ROM or DVD, an image usually includes not only the data of each sector, but the control headers and error correction fields for each sector as well. Since raw image files hold no additional data, metadata, beyond the storage content, determining the structure of an existing image can be difficult. Either a user remembers what a file contains via their memory or records metadata in the file name or via some other mechanism. In some cases, a tool can detect as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floppy Disk
A floppy disk or floppy diskette (casually referred to as a floppy, a diskette, or a disk) is a 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. The three most popular (and commercially available) floppy disks are the 8-inch, 5¼-inch, and 3½-inch floppy disks. 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 in 1971, had a disk diameter of . Subsequently, the 5¼-inch (133.35 mm) and then the 3½-inch (88.9 mm) 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resource Fork
A resource fork is a fork of a file on Apple's classic Mac OS operating system that is used to store structured data. It is one of the two forks of a file, along with the data fork, which stores data that the operating system treats as unstructured. Resource fork capability has been carried over to the modern macOS for compatibility. A resource fork stores information in a specific form, containing details such as icon bitmaps, the shapes of windows, definitions of menus and their contents, and application code ( machine code). For example, a word processing file might store its text in the data fork, while storing any embedded images in the same file's resource fork. The resource fork is used mostly by executables, but any file can have a resource fork. In a 1986 technical note, Apple strongly recommended that developers do not put general data into the resource fork of a file. According to Apple, there are parts of the system software that rely on resource forks having only v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
File Compression
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder. The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding: encoding is done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means for mapping data onto a signal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Command Line Interface
A command-line interface (CLI) is a means of interacting with software via commands each formatted as a line of text. Command-line interfaces emerged in the mid-1960s, on computer terminals, as an interactive and more user-friendly alternative to the non-interactive mode available with punched cards. For a long time, a CLI was the most common interface for software, but today a graphical user interface (GUI) is more common. Nonetheless, many programs such as operating system and software development utilities still provide CLI. A CLI enables automating programs since commands can be stored in a script file that can be used repeatedly. A script allows its contained commands to be executed as group; as a program; as a command. A CLI is made possible by command-line interpreters or command-line processors, which are programs that execute input commands. Alternatives to a CLI include a GUI (including the desktop metaphor such as Windows), text-based menuing (including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
