Data storage

• Disk storage
  Disk storage
  Disk storage or disc storage is a general category of storage mechanisms, in which data are digitally recorded by various electronic, magnetic, optical, or mechanical methods on a surface layer deposited of one or more planar, round and rotating disks...
  
  , a general category of data storage mechanisms
  • Magnetic disk
    • Floppy disk
      Floppy disk
      A floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles...
      
      , a magnetic data storage device using a flexible disc
    • Hard disk drive, a non-volatile magnetic data storage device
  • Optical disc
    Optical disc
    In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes binary data in the form of pits and lands on a special material on one of its flat surfaces...
    
    , commonly a polycarbonate disc
    • Blu-ray Disc
      Blu-ray Disc
      Blu-ray Disc is an optical disc storage medium designed to supersede the DVD format. The plastic disc is 120 mm in diameter and 1.2 mm thick, the same size as DVDs and CDs. Blu-ray Discs contain 25 GB per layer, with dual layer discs being the norm for feature-length video discs...
      
       (BD), a high-density optical disc intended mainly for video storage
    • Compact Disc
      Compact Disc
      The Compact Disc is an optical disc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage , write-once audio and data storage , rewritable media , Video Compact Discs , Super Video Compact Discs ,...
      
       (CD), a form of optical disc used mainly for audio data
    • Digital Versatile Disc (DVD), a form of optical disc used mainly for video and other data
    • Enhanced Versatile Disc
      Enhanced Versatile Disc
      The Enhanced Versatile Disc is an optical medium-based digital audio/video format, developed to provide a means for playing HDTV content using existing optical media. It was announced on November 18, 2003, by the People's Republic of China's Xinhua News Agency as a response to the popular...
      
       (EVD), an optical medium-based digital audio/video format under development
    • High-Definition Digital Versatile Disc (HD DVD), a high-density optical disc intended mainly for video storage
    • Holographic Versatile Disc
      Holographic Versatile Disc
      The Holographic Versatile Disc is an optical disc technology developed between April 2004 and mid-2008 that can store up to several terabytes of data on an optical disc the same size as a CD, DVD or Blu-ray disc. It employs a technique known as collinear holography, whereby a green and red laser...
      
       (HVD), a next generation ultra-high-density optical disc format replacement for blu-ray
    • Laserdisc
      Laserdisc
      LaserDisc was a home video format and the first commercial optical disc storage medium. Initially licensed, sold, and marketed as MCA DiscoVision in North America in 1978, the technology was previously referred to interally as Optical Videodisc System, Reflective Optical Videodisc, Laser Optical...
      
       (LD), the first commercial optical disc storage medium
    • MiniDisc
      MiniDisc
      The disc is permanently housed in a cartridge with a sliding door, similar to the casing of a 3.5" floppy disk. This shutter is opened automatically by a mechanism upon insertion. The audio discs can either be recordable or premastered. Recordable MiniDiscs use a magneto-optical system to record...
      
       (MD), a magneto-optical disc-based data storage device
  • Disc film
    Disc film
    thumb|Cartridge of disc filmDisc film was a still-photography film format aimed at the consumer market, and introduced by Kodak in 1982.The film was in the form of a flat disc, and was fully housed within a plastic cartridge...
    
    , a still-photography film format
  • RAM disk
    RAM disk
    A RAM disk or RAM drive is a block of RAM that a computer's software is treating as if the memory were a disk drive...
    
    , a volatile solid state drive
• Analog
  Analog signal
  An analog or analogue signal is any continuous signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. It differs from a digital signal in terms of small fluctuations in the signal which are...
  
   discs typically relying on a modulated groove to record signals
  • Gramophone record
    Gramophone record
    A gramophone record, commonly known as a phonograph record , vinyl record , or colloquially, a record, is an analog sound storage medium consisting of a flat disc with an inscribed, modulated spiral groove...
    
    , an analog recording medium
  • LP record
    LP record
    The LP, or long-playing microgroove record, is a format for phonograph records, an analog sound storage medium. Introduced by Columbia Records in 1948, it was soon adopted as a new standard by the entire record industry...
    
     a specific type of gramophone record
  • Aluminum disc
    Aluminum disc
    An aluminium disc is a disk made out of aluminium and is used as a transcription disc in magnetic recording media, specifically early radio recordings...
    
     an analog recording disc used mainly for early radio recordings
  • Acetate disc
    Acetate disc
    An acetate disc, also known as a test acetate, dubplate , lacquer , transcription disc or instantaneous disc...
    
     an aluminium disc coated with nitrocellulose lacquer

Astronomy

• Accretion disc
  Accretion disc
  An accretion disc is a structure formed by diffuse material in orbital motion around a central body. The central body is typically a star. Gravity causes material in the disc to spiral inward towards the central body. Gravitational forces compress the material causing the emission of...
  
  , diffuse material in orbital motion around a central body such as a star or black hole
• Debris disk
  Debris disk
  A debris disk is a circumstellar disk of dust and debris in orbit around a star. Sometimes these disks contain prominent rings, as seen in the image of Fomalhaut on the right. Debris disks have been found around both evolved and young stars, as well as at least one debris disk in orbit around a...
  
  , a ring shaped circumstellar disk of dust and debris in orbit around a star
• Disc (galaxy)
  Disc (galaxy)
  A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies.The galactic disc is the plane in which the spirals, bars and discs of disc galaxies exist. Galaxy discs tend to have more gas and dust, and younger stars than galactic bulges, or galactic haloes.The galactic...
  
  , a disc-shaped group of stars
• Protoplanetary disk
  Protoplanetary disk
  A protoplanetary disk is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star...
  
  , a rotating disc of dense gas surrounding a newly formed star, a form of accretion disc
• Scattered disc
  Scattered disc
  The scattered disc is a distant region of the Solar System that is sparsely populated by icy minor planets, a subset of the broader family of trans-Neptunian objects. The scattered-disc objects have orbital eccentricities ranging as high as 0.8, inclinations as high as 40°, and perihelia greater...
  
  , a distant region of the Solar System thinly populated by icy minor planets

Biology

• Death-inducing signaling complex
  Death-inducing signaling complex
  The death-inducing signaling complex or DISC is a multi-protein complex formed by members of the "death receptor" family of apoptosis-inducing cellular receptors. A typical example is FasR, which forms the DISC upon trimerization as a result of its ligand binding. Dogma states that the DISC is...
  
  , a multi-protein complex formed by members of the death receptor family of apoptosis-inducing cellular receptors
• Disk, an enlargement or outgrowth from the receptacle of the flower
• Intervertebral disc
  Intervertebral disc
  Intervertebral discs lie between adjacent vertebrae in the spine. Each disc forms a cartilaginous joint to allow slight movement of the vertebrae, and acts as a ligament to hold the vertebrae together.-Structure:...
  
  , in animal anatomy, part of the spine
• Placenta
  Placenta
  The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. "True" placentas are a defining characteristic of eutherian or "placental" mammals, but are also found in some snakes and...
  
   or placental disc, in mammals, an organ that connects a developing fetus to its mother's uterus
• Optic disc
  Optic disc
  The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point. This causes a break in the visual field called "the blind spot" or the "physiological blind spot"...
  
  , in the retina

Mathematics

• Disk (mathematics)
  Disk (mathematics)
  In geometry, a disk is the region in a plane bounded by a circle.A disk is said to be closed or open according to whether or not it contains the circle that constitutes its boundary...
  
  , the region in a plane enclosed by a circle
• Disk algebra
  Disk algebra
  In function theory, the disk algebra A is the set of holomorphic functionswhere D is the open unit disk in the complex plane C, f extends to a continuous function on the closure of D...
  
  , a concept in function theory
• Unit disk, a disk with radius one

Psychology

• DISC1
  DISC1
  Disrupted in schizophrenia 1 is a protein that is encoded by the DISC1 gene in humans. In coordination with a wide array of interacting partners, DISC1 has been shown to participate in the regulation of cell proliferation, differentiation, migration, neuronal axon and dendrite outgrowth,...
  
   (Disrupted in Schizophrenia 1), a human gene with a wide array of interactions
• DISC assessment
  DISC assessment
  DISC is a group of psychological inventories developed by John Geier, and others, and based on the 1928 work of psychologist William Moulton Marston and the original behavioralist Walter V. Clarke and others.-History:...
  
  , in psychology, a group of psychometric tests based on the work of William Moulton Marston

Motoring

• Disc brake
  Disc brake
  The disc brake or disk brake is a device for slowing or stopping the rotation of a wheel while it is in motion.A brake disc is usually made of cast iron, but may in some cases be made of composites such as reinforced carbon–carbon or ceramic matrix composites. This is connected to the wheel and/or...
  
  , a device for slowing or stopping the rotation of a wheel
• Disc parking
  Disc parking
  Disc parking is a system of allowing time-restricted free parking through display of a parking disc or clock disc showing the time at which the vehicle was parked. A patrolling parking attendant can inspect the disc to check whether payment is owed...
  
  , a parking regulation with free parking when using a parking disc (clock disc)
• Vehicle licence
  Vehicle licence
  A valid vehicle licence is required by law in some countries to be displayed on any registered motor vehicle if it is to be used or kept on a public road.-Worldwide:...
  
  , commonly known as a "tax disc" in the UK, is a vehicle licence receipt placed inside the windscreen

Other uses

• International Symposium on Distributed Computing
  International Symposium on Distributed Computing
  The International Symposium on Distributed Computing is an annual academic conference for refereed presentations, whose focus is the theory, design, analysis, implementation, and application of distributed systems and networks. The Symposium is organized in association with the European...
  
  , abbreviated as "DISC", an academic conference
• Disc (band)
  Disc (band)
  Disc is an experimental group formed by Miguel Depedro , Jason Doerck , M. C. Schmidt and Drew Daniel . The group was most active between 1997 and 1999....
  
  , an American experimental music band
• Disc (magazine)
  Disc (magazine)
  Disc was a weekly British popular music magazine, published between 1958 and 1975, when it was incorporated into Record Mirror. It was also known for periods as Disc Weekly and Disc and Music Echo ....
  
  , a British music magazine, at one time known as Disc and Music Echo
• Disc harrow
  Disc harrow
  A disc harrow is a farm implement that is used to cultivate the soil where crops are to be planted. It is also used to chop up unwanted weeds or crop remainders. It consists of many iron or steel discs which have slight concavity and are arranged into two or four sections...
  
  , a farm implement
• Disc jockey
  Disc jockey
  A disc jockey, also known as DJ, is a person who selects and plays recorded music for an audience. Originally, "disc" referred to phonograph records, not the later Compact Discs. Today, the term includes all forms of music playback, no matter the medium.There are several types of disc jockeys...
  
  , a person who selects and plays pre-recorded music for an audience
• Discworld
  Discworld
  Discworld is a comic fantasy book series by English author Sir Terry Pratchett, set on the Discworld, a flat world balanced on the backs of four elephants which, in turn, stand on the back of a giant turtle, Great A'Tuin. The books frequently parody, or at least take inspiration from, J. R. R....
  
  , a comedic fantasy book series by the British author Terry Pratchett
• Flying disc, a throwing toy or Frisbee
• Confederation of Revolutionary Trade Unions of Turkey abbreviated as "DİSK" in Turkish, a trade union centre
• Dundee International Sports Centre
  Dundee International Sports Centre
  Dundee International Sports Center is a sports centre in Dundee, Scotland, opened in the late 1990s. In 1998, DISC staged the European Hockey Championships.- Present day :...
  
   (DISC), a sports centre in Scotland
• Defence Intelligence and Security Centre
  Defence Intelligence and Security Centre
  Defence Intelligence and Security Centre is the location of the Headquarters of both the Defence College of Intelligence and the British Army Intelligence Corps...
  
   (DISC), headquarters of the British Army Intelligence Corps
• Independent Conference (Delaware) or the Delaware Independent School Conference (DISC), a high-school sports conference