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Disk storage
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<p>Disk storage (also sometimes called drive storage) is a <a href="/facts/Data_storage/uCvJ6nrq">data storage</a> 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. Notable types are <a href="/facts/Hard_disk_drive/kekLSGSE">hard disk drives</a> (HDD), containing one or more non-removable rigid <a href="/facts/Hard_disk_drive_platter/jX8FmT8I">platters</a>; the <a href="/facts/Floppy_disk/rShxfuxa"> floppy disk drive</a> (FDD) and its removable <a href="/facts/Floppy_disk/rShxfuxa">floppy disk</a>; and various <a href="/facts/Optical_disc_drive/IM9ugGbU">optical disc drives</a> (ODD) and associated <a href="/facts/Optical_disc/vjVDB1GH">optical disc</a> media. </p><p>(The <a href="/facts/Spelling_of_disc/SSmUDrM6">spelling <i>disk</i> and <i>disc</i></a> are used interchangeably except where trademarks preclude one usage, e.g., the Compact Disc logo. The choice of a particular form is frequently historical, as in IBM's usage of the <i>disk</i> form beginning in 1956 with the "<a href="/facts/IBM_magnetic_disk_drives/rot8kJdv">IBM 350 disk storage unit</a>".) </p>