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Disk generally refers to disk storage (a general category of data storage mechanisms) which may include:

  • Magnetic disk
    • Floppy disk, a magnetic data storage device using a flexible disc.
    • Hard disk drive, a non-volatile magnetic data storage device.
  • Optical disc, commonly a polycarbonate disc
    • Blu-ray Disc (BD), a high-density optical disc intended mainly for video storage.
    • Compact Disc (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 (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 (HVD), a next generation ultra-high-density optical disc format replacement for blu-ray.
    • Laserdisc (LD), the first commercial optical disc storage medium.
    • MiniDisc (MD), a magneto-optical disc-based data storage device.
  • Disc film, a still-photography film format.
  • RAM disk, a volatile solid state drive.
  • Solid State Disk (SSD) - A flash-based permanent storage
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