Hard disk drive

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mick
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Hard disk drive

Post by mick » Sun Feb 12, 2017 5:53 pm

From Wikipedia, the free encyclopedia


In 1953, IBM recognized the immediate application for what it termed a "Random Access File" having high capacity and rapid random access at a relatively low cost.[1] After considering technologies such as wire matrices, rod arrays, drums, drum arrays, etc.,[1] the engineers at IBM's San Jose California laboratory invented the hard disk drive.[2] The disk drive created a new level in the computer data hierarchy, then termed Random Access Storage but today known as secondary storage, less expensive and slower than main memory (then typically drums) but faster and more expensive than tape drives.[3]

The commercial usage of hard disk drives began in 1956, with the shipment of an IBM 305 RAMAC system including IBM Model 350 disk storage.[4] US Patent 3,503,060 issued March 24, 1970, and arising from the IBM RAMAC program is generally considered to be the fundamental patent for disk drives.[5]

Each generation of disk drives replaced larger, more sensitive and more cumbersome devices. The earliest drives were usable only in the protected environment of a data center. Later generations progressively reached factories, offices and homes, eventually reaching ubiquity.

Disk media diameter was initially 24-inches in diameter but over time it has been reduced to today's typically 95 or 65 millimetres (3.7 or 2.6 in). Drives with the larger 24-inch and 14-inch diameter media were typically mounted in standalone boxes (resembling washing machines) or large equipment rack enclosures. Individual drives often required high-current AC power due to the large motors required to spin the large disks. Drives with smaller media generally conformed to de facto standard form factors.

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 of about 1 gigabyte.[6] As of August 2016, desktop hard disk drives typically had a capacity of 1 to 4 terabytes, with the largest-capacity drives reaching 10 terabytes.

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mick
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Re: Hard disk drive

Post by mick » Mon Feb 13, 2017 7:21 pm

People are forgetting, search for "winchester drive".

This is bull:
The name 'Winchester' and some derivatives are still common in some non-English speaking countries to generally refer to any hard disks (e.g. Hungary, Russia).

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