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  2. Magnetic storage - Wikipedia

    en.wikipedia.org/wiki/Magnetic_storage

    Longitudinal recording and perpendicular recording, two types of writing heads on a hard disk. Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory.

  3. Hard disk drive - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive

    A hard disk drive (HDD), hard disk, hard drive, or fixed disk [a] is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.

  4. Hard disk drive platter - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_platter

    A hard disk drive platter or hard disk is the circular magnetic disk on which digital data is stored in a hard disk drive. [1] The rigid nature of the platters is what gives them their name (as opposed to the flexible materials which are used to make floppy disks). Hard drives typically have several platters which are mounted on the same spindle.

  5. Disk storage - Wikipedia

    en.wikipedia.org/wiki/Disk_storage

    Disk storage (also sometimes called drive storage) is a data storage mechanism based on a rotating disk. 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.

  6. Disk read-and-write head - Wikipedia

    en.wikipedia.org/wiki/Disk_read-and-write_head

    A disk read-and-write head is the small part of a disk drive that moves above the disk platter and transforms the platter's magnetic field into electric current (reads the disk) or, vice versa, transforms electric current into magnetic field (writes the disk). [1] The heads have gone through a number of changes over the years.

  7. Computer data storage - Wikipedia

    en.wikipedia.org/wiki/Computer_data_storage

    Hard disk drive, used for secondary storage. Magnetic tape, used for tertiary and off-line storage; Carousel memory (magnetic rolls). In early computers, magnetic storage was also used as: Primary storage in a form of magnetic memory, or core memory, core rope memory, thin-film memory and/or twistor memory; Tertiary (e.g. NCR CRAM) or off line ...

  8. 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]

  9. Drum memory - Wikipedia

    en.wikipedia.org/wiki/Drum_memory

    Drums were displaced as primary computer memory by magnetic core memory, which offered a better balance of size, speed, cost, reliability and potential for further improvements. [4] Drums were then replaced by hard disk drives for secondary storage, which were both less expensive and offered denser storage. The manufacturing of drums ceased in ...

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