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  2. List of disk drive form factors - Wikipedia

    en.wikipedia.org/wiki/List_of_disk_drive_form...

    8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.

  3. Floppy disk variants - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk_variants

    A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...

  4. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    3 1 ⁄ 2 inch Single 1 80 2 1,280 200 kB [29] FM Used only in Tandy Portable Disk Drive 2 5 1 ⁄ 4 inch Double 1 35 18 256 157 kB [30] MFM Color Computer HP 9114A 3 1 ⁄ 2 inch Double 2 80 16 256 128-710kB [31] 600 MFM Used with HP 110 and Portable Series 40 & 70 HP 9895A 8 inch Double 2 77 29 256 1.18 MB [32] 360 MFM HP 9130K 5 1 ⁄ 4 inch ...

  5. Hard disk drive interface - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_interface

    The SAS is a new generation serial communication protocol for devices designed to allow for much higher speed data transfers and is compatible with SATA. SAS uses a mechanically identical data and power connector to standard 3.5-inch SATA1/SATA2 HDDs, and many server-oriented SAS RAID controllers are also capable of addressing SATA hard drives.

  6. Western Digital Raptor - Wikipedia

    en.wikipedia.org/wiki/Western_Digital_Raptor

    Western Digital WD740GD A Fujitsu laptop drive (80 GB, 7,200 RPM) on the left and a Western Digital VelociRaptor (300 GB, 10,000 RPM). The Western Digital Raptor (often marketed as WD Raptor, 2.5" models known as VelociRaptor) is a discontinued series of high performance hard disk drives produced by Western Digital first marketed in 2003.

  7. Floppy disk drive interface - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk_drive_interface

    A cable could have 5.25-inch style connectors, 3.5-inch style connectors, or a combination. After IBM introduced the "twist" to floppy cables, and when both 5.25-inch and 3.5-inch drives were in common use, many cables had four connectors: one of each type before the twist, and one of each type after the twist.

  8. History of the floppy disk - Wikipedia

    en.wikipedia.org/wiki/History_of_the_floppy_disk

    By 1988, the 3 + 1 ⁄ 2-inch was outselling the 5 + 1 ⁄ 4-inch. [69] In South Africa, the 3 + 1 ⁄ 2-inch format was generally called a stiffy disk, to distinguish it from the flexible 5 + 1 ⁄ 4-inch format. [70] [71] The term "3 + 1 ⁄ 2-inch" or "3.5-inch" disk is and was rounded from the 90 mm actual dimension of one side of the ...

  9. Disk density - Wikipedia

    en.wikipedia.org/wiki/Disk_density

    Floppy drives utilize 300-oersted write heads, FM encoding, and a track width of 0.330 mm (0.0130 in) for a density of 48 tracks-per-inch (tpi) and 5,876 bits-per-inch (bpi). Double density (DD or 2D) doubles capacity over SD by replacing FM encoding with an improved line code , such as modified frequency modulation (MFM), modified modified ...

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