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An eSATA and Mini USB hard disk enclosure board Multiple connectors including external power on a 2.5 inch enclosure The PCB of an enclosure controls the data transfer, generic mass storage device drivers are readily available on most operating systems This 2.5 inch caddy uses a single connector mini USB
Drive bay-compatible computer case accessories that do not connect to the motherboard or power supply at all are also common, such as small storage drawers or even cup holders. A 1980s white box IBM PC compatible with one full-height 5.25-inch drive bay containing a half-height 5.25-inch floppy drive [ a ]
Two on-blade disks (2,5" PCIe SSD, SATA HDD or SAS HDD) are installable for local storage with a range of RAID controller options. Two external and one internal USB ports and two SD card slots. The blades can come pre-installed with Windows 2008 R2 SP1, Windows 2012 R2, SuSE Linux Enterprise or RHEL.
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.
A data cable (top) and control cable (below) connecting a controller card and an ST-506 type HDD. Power cable not shown. The earliest hard disk drive (HDD) interfaces were bit serial data interfaces that connected an HDD to a controller with two cables, one for control and one for data.
Some devices, such as 2.5-inch drives, can operate off the 5 V supplied by laptop eSATAp ports. Others, such as 3.5-inch drives, also require 12 V; they can be powered from a desktop eSATAp port, but require an external 12 V power supply if used with a laptop computer. This can lead to confusion if users are not aware of the distinction.