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An external hard drive enclosure that uses a 2.5-in drive and a USB connection for power and transfer. Key benefits to using external disk enclosures include: Adding additional storage space and media types to small form factor and laptop computers, as well as sealed embedded systems such as digital video recorders [1] and video game consoles. [2]
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.
From left to right: full-height 5.25″ drive, two half-height 5.25″ drives, and (sideways) a 3.5″ drive. A drive bay is a standard-sized area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed.
Most cases include drive bays on the front of the case; a typical ATX case includes 5.25", 3.5" and 2.5" bays. In modern computers, the 5.25" bays are used for optical drives, the 3.5" bays are used for hard drives and card readers, and the 2.5" bays are used for solid-state drives.
External hard disk drives are usually available as assembled integrated products, but may be also assembled by combining an external enclosure (with USB or other interface) with a separately purchased drive. They are available in 2.5-inch and 3.5-inch sizes; 2.5-inch variants are typically called portable external drives, while 3.5-inch ...
Traditionally, full-tower systems had between four and six externally accessible half-height 5.25-inch drive bays and up to ten 3.5-inch drive bays. [6] [5]: 138 Some full-tower cases included locking side-doors and other physical security features to prevent theft of the discs inside those bays. [7]
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