Disc

Disc or disk (computing and American English) may refer to:

Data storage

Disk (mathematics)

In geometry, a disk (also spelled disc) is the region in a plane bounded by a circle. A disk is said to be closed or open according to whether it contains the circle that constitutes its boundary.

Formulas

In Cartesian coordinates, the open disk of center and radius R is given by the formula

while the closed disk of the same center and radius is given by

The area of a closed or open disk of radius R is πR² (see area of a disk).

Properties

The disk has circular symmetry.

The open disk and the closed disk are not topologically equivalent (that is, they are not homeomorphic), as they have different topological properties from each other. For instance, every closed disk is compact whereas every open disk is not compact. However from the viewpoint of algebraic topology they share many properties: both of them are contractible and so are homotopy equivalent to a single point. This implies that their fundamental groups are trivial, and all homology groups are trivial except the 0th one, which is isomorphic to Z. The Euler characteristic of a point (and therefore also that of a closed or open disk) is 1.

Floppy disk

A floppy disk, also called a diskette or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. Floppy disks are read and written by a floppy disk drive (FDD).

Floppy disks, initially as 8-inch (200 mm) media and later in 5¼-inch (133 mm) and 3½-inch (90 mm) sizes, were a ubiquitous form of data storage and exchange from the mid-1970s well into the 2000s.

By 2010, computer motherboards are rarely manufactured with floppy drive support; 3½-inch floppy disks can be used with an external USB floppy disk drive, but USB drives for 5¼-inch, 8-inch, and non-standard diskettes are rare to non-existent. These formats are usually handled by older equipment.

While floppy disk drives still have some limited uses, especially with legacy industrial computer equipment, they have been superseded by data storage methods with much greater capacity, such as USB flash sticks, flash storage cards, portable external hard disk drives, optical discs, and computer networks.

Review

A review is an evaluation of a publication, service, or company such as a movie (a movie review), video game (video game review), musical composition (music review of a composition or recording), book (book review); a piece of hardware like a car, home appliance, or computer; or an event or performance, such as a live music concert, play, musical theater show, dance show, or art exhibition. In addition to a critical evaluation, the review's author may assign the work a rating to indicate its relative merit. More loosely, an author may review current events, trends, or items in the news. A compilation of reviews may itself be called a review. The New York Review of Books, for instance, is a collection of essays on literature, culture, and current affairs. National Review, founded by William F. Buckley, Jr., is an influential conservative magazine, and Monthly Review is a long-running socialist periodical.

In academia

A peer review is the process by which scholars or scientists assess the work of their colleagues that has been submitted for publication in the scientific or scholarly literature.

Review (magazine)

Review is an American magazine covering national and international economic issues. It is published by the Federal Reserve Bank of St. Louis.

References

External links

Review (band)

Review (Bulgarian: Ревю) is a Bulgarian new wave band that spawned in the late 1980s and has been one of the most influential acts in the history of Bulgarian rock music. It was founded by Vasil Giurov, Kiril Manchev, Boicho Karaboichev and Milena Slavova in 1985 in Sofia. Their first album was called Reviu-ІV.88-V.89 and includes 10 tracks. The band split up in 1990 and reformed in 2001. They released the album 10 in 2002. In 2003 Милена quit the band and left for England.

DotGNU

DotGNU is a decommissioned part of the GNU Project that aims to provide a free software replacement for Microsoft's .NET Framework by Free Software Foundation. Other goals of the project are better support for non-Windows platforms and support for more processors.

The main goal of the DotGNU project code base was to provide a class library that is 100% Common Language Specification (CLS) compliant.

Main development projects

Portable.NET

DotGNU Portable.NET, an implementation of the ECMA-335 Common Language Infrastructure (CLI), includes software to compile and run Visual Basic .NET, C#, and C applications that use the .NET base class libraries, XML, and Windows Forms. Portable.NET claims to support various instruction set architectures including x86, PPC, ARM, and SPARC.

phpGroupWare

phpGroupWare, a multi-user web-based GroupWare suite, which also serves to provide a collection of webservice components that can be accessed through XML-RPC so that can easily integrate them into webservice applications.