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For example, a typical 1 TB hard disk with 512-byte sectors provides additional capacity of about 93 GB for the ECC data. [65] In the newest drives, as of 2009, [66] low-density parity-check codes (LDPC) were supplanting Reed–Solomon; LDPC codes enable performance close to the Shannon limit and thus provide the highest storage density available.
Until that time, they were last hard disk manufacturer to produce PATA hard disk drives. [30] Furthermore, they were the only manufacturer that had 250 GB and 320 GB in 2.5-inch form factor. In February 2014, Western Digital announced a new "Purple" line of hard disk drives for use in video surveillance systems, with capacities from 1 to 4 TB.
Wong, Poh-Kam (July 1999). "The Dynamics of the HDD Industry Development in Singapore" (PDF).Centre for Management of Innovation and Technopreneurship, National University of Singapore: The Information Storage Industry Center, Graduate School of International Relations and Pacific Studies, University of California.
HGST, Inc. (Hitachi Global Storage Technologies) was a manufacturer of hard disk drives, solid-state drives, and external storage products and services. It was initially a subsidiary of Hitachi, formed through its acquisition of IBM's disk drive business. It was acquired by Western Digital in 2012. However, until October 2015, it was required ...
Enterprise-class drives can have a height up to 15 mm. Seagate released a 7 mm drive aimed at entry level laptops and high end netbooks in December 2009. Western Digital released on April 23, 2013 a hard drive 5 mm in height specifically aimed at Ultrabooks. [37] Toshiba MK1216GSG 1.8" 120 GB hard disk drive with Micro SATA
For example, the first commercial hard drive, IBM's RAMAC in 1957, supplied 3.75 MB for $34,500, or $9,200 per megabyte. In 1989, a 40 MB hard drive cost $1200, or $30/MB. And in 2018, 4 Tb drives sold for $75, or 1.9¢/GB, an improvement of 1.5 million since 1989 and 520 million since the RAMAC.