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  2. Magneto-optical drive - Wikipedia

    en.wikipedia.org/wiki/Magneto-optical_drive

    A magneto-optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto-optical disc. 130 mm (5.25 in) and 90 mm (3.5 in) discs are the most common sizes. In 1983, just a year after the introduction of the compact disc , Kees Schouhamer Immink and Joseph Braat presented the first experiments with erasable ...

  3. Optical disc drive - Wikipedia

    en.wikipedia.org/wiki/Optical_disc_drive

    Optical drives for computers come in two main form factors: half-height (also known as desktop drive) and slim type (used in laptop computers and compact desktop computers). They exist as both internal and external variants. Half-height optical drives are around 4 centimetres tall, while slim type optical drives are around 1 cm tall.

  4. Disk storage - Wikipedia

    en.wikipedia.org/wiki/Disk_storage

    The recording employs various electronic, magnetic, optical, or mechanical changes to the disk's surface layer. A disk drive is a device implementing such a storage mechanism. Notable types are hard disk drives (HDD), containing one or more non-removable rigid platters ; the floppy disk drive (FDD) and its removable floppy disk ; and various ...

  5. Optical storage - Wikipedia

    en.wikipedia.org/wiki/Optical_storage

    An optical disc drive is a device in a computer that can read CD-ROMs or other optical discs, such as DVDs and Blu-ray discs. Optical storage differs from other data storage techniques that make use of other technologies such as magnetism, such as floppy disks and hard disks, or semiconductors, such as flash memory.

  6. Disk sector - Wikipedia

    en.wikipedia.org/wiki/Disk_sector

    In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. For most disks, each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs), and 2048 bytes for CD-ROMs , DVD-ROMs and BD-ROMs . [ 1 ]

  7. Magnetic storage - Wikipedia

    en.wikipedia.org/wiki/Magnetic_storage

    When writing, the magnetic medium is heated locally by a laser, which induces a rapid decrease of coercive field. Then, a small magnetic field can be used to switch the magnetisation. The reading process is based on magneto-optical Kerr effect. The magnetic medium are typically amorphous R-Fe-Co thin film (R being a rare earth element).

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Drum memory - Wikipedia

    en.wikipedia.org/wiki/Drum_memory

    A US patent filed in January 1954 by Baumeister of IBM disclosed a "spring loaded and air supported shoe for poising a magnetic head above a rapidly rotating magnetic drum." [6] Flying heads became standard in drums and hard disk drives. Magnetic drum units used as primary memory were addressed by word.