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Software reports hard disk drive or memory capacity in different forms using either decimal or binary prefixes. The Microsoft Windows family of operating systems uses the binary convention when reporting storage capacity, so an HDD offered by its manufacturer as a 1 TB drive is reported by these operating systems as a 931 GB HDD.
In 1993, Seagate released the first Barracuda drive, with the ST11950. The drive had a capacity of 2.03 GB (1.69 GB formatted), was available with FAST SCSI-2 (N/ND models) or WIDE SCSI-2 (W/WD models) interface, and was the first hard drive ever to have a spindle speed of 7200-RPM.
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.
The capacity of hard drives has grown exponentially over time. When hard drives became available for personal computers, they offered 5-megabyte capacity. During the mid-1990s the typical hard disk drive for a PC had a capacity in the range of 500 megabyte to 1 gigabyte. [6] As of October 2024 hard disk drives up to 32 TB were available. [7]
The internal SSD is connected to the external USB-C interface via an ASMedia 2362 bridge chip. Power for the drive is supplied via the USB connection, requiring the USB host port to be able to supply 5V at up to 1.5A. The drive was made available in capacities of 500 GB and 1 TB. [2] The drive is formatted as exFAT by default. [3]
Western Digital later "updated" the line by rebranding a WD Blue drive to the Z5K500.B and WD Black to Z7K500.B, the Z5K500.B can only be configured with 16 MB cache while the Z7K500.B is only available with 32MB cache. In 2017 Western Digital released the Z5K1, a 7mm 1TB hard drive that is the only HGST drive to ever feature drive-managed SMR.
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