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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.
"2.5-inch" drive: (2.75 in × 3.945 in × 0.374 in = 69.85 mm × 100.2 mm × 9.5 mm) This even smaller, 2.75-inch-wide (70 mm) form factor is widely used today in notebook computers and similar small-footprint devices. One commonplace feature for these drives is radically lower power consumption than is found in larger drives.
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 ]
Inner view of a 1998 Seagate HDD that used the Parallel ATA interface 2.5-inch SATA drive on top of 3.5-inch SATA drive, showing close-up of (7-pin) data and (15-pin) power connectors. Current hard drives connect to a computer over one of several bus types, including parallel ATA, Serial ATA, SCSI, Serial Attached SCSI (SAS), and Fibre Channel.
There are seven models of the 1311 disk drive. The first drive attached to a system is a "master drive" which contains the controller and can control a number of Model 2 "slave drives." [34] Master drive on an IBM 1440, IBM 1460, or IBM 1240 system and can control up to four Model 2 drives. Introduced October 11, 1962.
one M.2 2260 drive one 2.5" drive one optical drive Intel I217-LM Gigabit Ethernet Intel Wireless-NB 7260 (802.11n) WLAN or Intel Wireless-AN 7260 (802.11n Bluetooth 4.0) WLAN or Intel Wireless-AC 7260 (802.11ac Bluetooth 4.0) WLAN optional HP hs3110 HSPA+ WWAN or HP lt4111 LTE/EV-DO/HSPA+ Gobi4G WWAN: 15.6" WLED FHD 400:1 300nits SVA
Since around 1990, where a hard drive is present it will typically be a 2.5-inch drive; some very compact laptops support even smaller 1.8-inch HDDs, and a very small number used 1" Microdrives. Some SSDs are built to match the size/shape of a laptop hard drive, but increasingly they have been replaced with smaller mSATA or M.2 cards.
Open Vault storage building blocks offer high disk densities, with 30 drives in a 2U Open Rack chassis designed for easy disk drive replacement. The 3.5 inch disks are stored in two drawers, five across and three deep in each drawer, with connections via serial attached SCSI. [24]
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