HDD : December 18, 2008

HDD
Image Data
File Name: 50D_02509
Model: Canon EOS 50D
Lens: Canon EF 100mm F/2.8 USM Macro
Date: 12.18.08 2:11am
Focal Length: 100mm (160mm)
Shutter: 1 s
F-Stop: F2.8
ISO: 100
Ex Bias: +1/3
Program: Aperture priority
Metering Mode: Evaluative
Flash: Off
Focus Mode: Manual focus

HDD

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12.18.2008
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All your data are belong to us.

A hard disk drive is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces. Strictly speaking, "drive" refers to a device distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its floppy disk. Early HDDs had removable media; however, an HDD today is typically a sealed unit (except for a filtered vent hole to equalize air pressure) with fixed media.

The first hard drive (the IBM 305 RAMAC) was introduced in 1956 as data storage for an IBM accounting computer. It required 50 24-inch disks to store 5MB of data and cost roughly $35,000 a year to lease - or $7,000 per megabyte per year. For years, hard disk drives were confined to mainframe and minicomputer installations. Vast "disk farms" of giant 14- and 8-inch drives costing tens of thousands of dollars each whirred away in the air conditioned isolation of corporate data centers.

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