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Disk packs and disk cartridges were early forms of removable media for computer data storage, introduced in the 1960s. ==Disk pack== A Disk pack is a layered grouping of hard disk platters (circular, rigid discs coated with a magnetic data storage surface). A disk pack is the core component of a hard disk drive. In modern hard disks, the disk pack is permanently sealed inside the drive. In many early hard disks, the disk pack was a removable unit, and would be supplied with a protective canister featuring a lifting handle. The protective cover consisted of two parts, a clear plastic shell, with a handle in the center, that enclosed the top and sides of the disks and a separate bottom that completed the sealed package. To remove the disk pack, the drive would be taken off line and allowed to spin down. Its access door could then be opened and an empty top shell inserted and twisted to unlock the disk platter from the drive and secure it to the top shell. The assembly would then be lifted out and the bottom cover attached. A different disk pack could then be inserted by removing the bottom and placing the disk pack with its top shell into the drive. Turning the handle would lock the disk pack in place and free the top shell for removal. The first removable disk pack was invented in 1965 by two IBM engineers, Thomas G. Leary and R. E. Pattison. The 14-inch (356 mm) diameter disks introduced by IBM became a ''de facto'' standard, with several vendors producing "IBM-compatible" drives and disk packs. Examples of disk drives that employed removable disk packs include the IBM 1311, IBM 2311, and the Digital RP04. File:Fotothek df n-10 0000117.jpg|Operator selects a disk pack File:Fotothek df n-10 0000118.jpg|Bottom cover is removed File:Fotothek df n-10 0000119.jpg|Disk pack is ready for insertion File:Disk Pack.jpg|The removable pack is in place File:IBM 1311 disk drive at CHM.agr.jpg|IBM 1311 disk drive with an extra IBM 1316 disk pack File:IBM2314DiskDrivesAndIBM2540CardReaderPunch.jpg|IBM 2314s with removable disk packs and empty covers on top File:Data General NOVA System.jpg|Data General Nova computer with removable disk cartridge 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「disk pack」の詳細全文を読む スポンサード リンク
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