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File Sequence
In computing, as well as in non-computing contexts, a file sequence is a well-ordered, (finite) collection of files, usually related to each other in some way. In computing, file sequences should ideally obey some kind of locality of reference principle, so that not only all the files belonging to the same sequence ought to be locally referenced to each other, but they also obey that as much as is their proximity with respect to the ordering relation. ''Explicit'' file sequences are, in fact, sequences whose filenames all end with a numeric or alphanumeric tag in the end (excluding file extension). The aforementioned locality of reference usually pertains either to the data, the metadata (e.g. their filenames or last-access dates), or the physical proximity within the storage media they reside in. In the latter acception it is better to speak about file contiguity (see below). Identification Every GUI program shows contents of folders by usually ordering its files according to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computing
Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes, and development of both hardware and software. Computing has scientific, engineering, mathematical, technological and social aspects. Major computing disciplines include computer engineering, computer science, cybersecurity, data science, information systems, information technology and software engineering. The term "computing" is also synonymous with counting and calculating. In earlier times, it was used in reference to the action performed by mechanical computing machines, and before that, to human computers. History The history of computing is longer than the history of computing hardware and includes the history of methods intended for pen and paper (or for chalk and slate) with or without the aid of tables. Computing is intimately tied to the representation of numbers, though mathematical conc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Command-line Interface
A command-line interpreter or command-line processor uses a command-line interface (CLI) to receive commands from a user in the form of lines of text. This provides a means of setting parameters for the environment, invoking executables and providing information to them as to what actions they are to perform. In some cases the invocation is conditional based on conditions established by the user or previous executables. Such access was first provided by computer terminals starting in the mid-1960s. This provided an interactive environment not available with punched cards or other input methods. Today, many users rely upon graphical user interfaces and menu-driven interactions. However, some programming and maintenance tasks may not have a graphical user interface and use a command line. Alternatives to the command-line interface include text-based user interface menus (for example, IBM AIX SMIT), keyboard shortcuts, and various desktop metaphors centered on the pointer (usual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Disk Burning
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for by using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inodes
The inode (index node) is a data structure in a Unix-style file system that describes a file-system object such as a file or a directory. Each inode stores the attributes and disk block locations of the object's data. File-system object attributes may include metadata (times of last change, access, modification), as well as owner and permission data. A directory is a list of inodes with their assigned names. The list includes an entry for itself, its parent, and each of its children. Etymology There has been uncertainty on the Linux kernel mailing list about the reason for the "i" in "inode". In 2002, the question was brought to Unix pioneer Dennis Ritchie, who replied: A 1978 paper by Ritchie and Ken Thompson bolsters the notion of "index" being the etymological origin of inodes. They wrote: Additionally, Maurice J. Bach wrote that an inode "is a contraction of the term index node and is commonly used in literature on the UNIX system". Details A file system relies on d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Filesystem
In computing, file system or filesystem (often abbreviated to fs) is a method and data structure that the operating system uses to control how data is stored and retrieved. Without a file system, data placed in a storage medium would be one large body of data with no way to tell where one piece of data stopped and the next began, or where any piece of data was located when it was time to retrieve it. By separating the data into pieces and giving each piece a name, the data are easily isolated and identified. Taking its name from the way a paper-based data management system is named, each group of data is called a "file". The structure and logic rules used to manage the groups of data and their names is called a "file system." There are many kinds of file systems, each with unique structure and logic, properties of speed, flexibility, security, size and more. Some file systems have been designed to be used for specific applications. For example, the ISO 9660 file system is designe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extents
In computing, an extent is a contiguous area of storage reserved for a file in a file system, represented as a range of block numbers, or tracks on count key data devices. A file can consist of zero or more extents; one file fragment requires one extent. The direct benefit is in storing each range compactly as two numbers, instead of canonically storing every block number in the range. Also, extent allocation results in less file fragmentation. Extent-based file systems can also eliminate most of the metadata overhead of large files that would traditionally be taken up by the block-allocation tree. But because the savings are small compared to the amount of stored data (for all file sizes in general) but make up a large portion of the metadata (for large files), the overall benefits in storage efficiency and performance are slight. In order to resist fragmentation, several extent-based file systems do allocate-on-flush. Many modern fault-tolerant file systems also do copy-on-wr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mass Storage
In computing, mass storage refers to the storage of large amounts of data in a persisting and machine-readable fashion. In general, the term is used as large in relation to contemporaneous hard disk drives, but it has been used large in relation to primary memory as for example with floppy disks on personal computers. Devices and/or systems that have been described as mass storage include tape libraries, RAID systems, and a variety of computer drives such as hard disk drives, magnetic tape drives, magneto-optical disc drives, optical disc drives, memory cards, and solid-state drives. It also includes experimental forms like holographic memory. Mass storage includes devices with removable and non-removable media. It does not include random access memory (RAM). There are two broad classes of mass storage: local data in devices such as smartphones or computers, and enterprise servers and data centers for the cloud. For local storage, SSDs are on the way to replacing HDDs. Consid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adobe After Effects
Adobe After Effects is a digital visual effects, motion graphics, and compositing application developed by Adobe Inc., and used in the post-production process of film making, video games and television production. Among other things, After Effects can be used for keying, tracking, compositing, and animation. It also functions as a very basic non-linear editor, audio editor, and media transcoder. In 2019, the program won an Academy Award for scientific and technical achievement. History After Effects was originally created by David Herbstman, David Simons, Daniel Wilk, David M. Cotter, and Russell Belfer at the Company of Science and Art in Providence, Rhode Island, where the first two versions of the software, 1.0 (January 1993) and 1.1, were released by the company. CoSA, whose CEO was William J. O'Farrell, along with After Effects was then acquired by Aldus Corporation in July 1993, which was in turn acquired by Adobe in 1994, and with it PageMaker. Adobe's first new release ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digitale Videosysteme
Rohde & Schwarz GmbH & Co KG (, ) is an international electronics group specializing in the fields of electronic test equipment, broadcast & media, cybersecurity, radiomonitoring and radiolocation, and radiocommunication. The company provides products for the wireless communications, broadcast & media, cybersecurity and electronics industry, aerospace and defense, homeland security and critical infrastructures. In addition to the Munich headquarters, there are regional headquarters in the United States (Columbia, Maryland) and in Asia (Singapore). About 7,700 of the company's employees work in Germany. Worldwide the company has a total of around 13,000 employees in over 70 countries. Exports account for around 85 percent of revenues. History The company was founded by Lothar Rohde and Hermann Schwarz who met while studying physics in Jena. They built their first T&M instrument in 1932, and in August 1933, the ''Physikalisch-Technisches Entwicklungslabor Dr. Rohde & Dr. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Da Vinci Systems
da Vinci Systems was an American digital cinema company founded in 1984 in Coral Springs, Florida as a spinoff of Video Tape Associates. It was known for its hardware-based color correction products, GPU-based color grading, digital mastering systems, and film restoration and remastering systems. It was one of the earliest pioneers in post-production products. The company was owned by Dynatech Corporation (Acterna after 2000) for the majority of its lifespan until being bought by JDS Uniphase in 2005 and by Blackmagic Design in 2009. Company history In 1982, Video Tape Associates (VTA), a Hollywood, Florida-based production/post-production facility, began developing the Wiz for internal use and introduced it to the public the following year. The Wiz controlled early telecines such as the RCA FR-35 and the Bosch FDL 60 and offered basic primary and secondary color correction. The American post-production facilities company EDITEL Group asked VTA to build multiple Wiz syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantel
Quantel was a company based in the United Kingdom and founded in 1973 that designed and manufactured digital production equipment for the broadcast television, video production and motion picture industries. They were headquartered in Newbury, Berkshire. Quantel acquired Snell Ltd. in March 2014. Following a period of consolidation the two companies started operating under the Snell name, trading as Snell Advanced Media or SAM, from September 2015, following the staged removal of the Quantel board of directors by incoming CEO Ray Cross. The name Quantel came from Quantised Television, in reference to the process of converting a television picture into a digital signal. History Quantel founder, Peter Michael, had previously founded Micro Consultants Group (MCG). MCG had pioneered a range of fast data conversion products that could be used for converting video signals from analog to digital and back to analog. These devices found use in many early Quantel products. In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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