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At least 218 companies have manufactured hard disk drives (HDDs) since 1956. Most of that industry has vanished through bankruptcy or mergers and acquisitions. None of the first several entrants (including IBM, who invented the HDD) continue in the industry today.
Circuit board of a 2.5-inch Samsung hard disk MP0402H. A typical HDD has two electric motors: a spindle motor that spins the disks and an actuator (motor) that positions the read/write head assembly across the spinning disks. The disk motor has an external rotor attached to the disks; the stator windings are fixed in place.
Hard disk drives store data in the magnetic polarization of small patches of the surface coating on a disk. The maximum areal density is defined by the size of the magnetic particles in the surface, as well as the size of the "head" used to read and write the data. In 1956 the first hard drive, the IBM 350, had an areal density of 2,000 bit/in 2.
A 500 GB Western Digital hard disk drive with a 16 MB buffer In computer storage , a disk buffer (often ambiguously called a disk cache or a cache buffer ) is the embedded memory in a hard disk drive (HDD) or solid-state drive (SSD) acting as a buffer between the rest of the computer and the physical hard disk platter or flash memory that is ...
Hard disk drive (HDD) Price per capacity SSDs are generally more expensive than HDDs and are expected to remain so. As of early 2018, SSD prices were around $0.30 per gigabyte for 4 TB models. [23] HDDs, as of early 2018, were priced around $0.02 to $0.03 per gigabyte for 1 TB models. [23] Storage capacity
Location of Ethiopia. Ethiopia is a country located in the Horn of Africa. According to the IMF, Ethiopia was one of the fastest-growing economies in the world, registering over 10% economic growth from 2004 through 2009. [1] It was the fastest-growing non-oil-dependent African economy in the years 2007 and 2008. [2]
On September 17, 2007, Texas Memory Systems (TMS) announced the RamSan-500, the world's first enterprise-class flash-based solid state disk (SSD). [2] The Flash Modules were designed from the ground up by Texas Memory Systems using proprietary form-factors, physical connectivity, hard-decision ECC algorithm, and flash translation layer (FTL ...
This is a list of equipment used by the Ethiopian Ground Forces. Small arms. Name Image Caliber Type Origin Notes Pistols PM [1] 9×18mm: Semi-automatic pistol