HDD

=HDD=

HDD stands for hard disk drive. A hard disk drive is a non-__volatile__ (volatile) that __stores__ (stores) digitally encoded data on a disc. (Non-__volatile__ volatile​ means that it can retain the stored information even when not on). Earlier HDDs had removable media while today it is s__ealed__ (sealed?) with a fixed unit. HDDs were mainly developed for the general purpose of computers. In the 1900s there was a need for a large-scale reliable storgage. That led to the invention of embedded systems (what are embedded systems? maybe you can explain a little). Embedded systems are computer systems designed to perform one or a few dedicated functions often with realtime copmuting constraints. (Realtime computing restraints is the study of hardware/software that puts a deadline on how fast the computer or website responds.) It is connected with hardware and mechanical parts to make a complete device. In the 21st century HDD is (is, we are still in the 21st century) used for camcorders, cellphones, digital audio players, digital video players, personal digital assitances, and video game consoles. Today HDDs can hold up to 300 gigabytes. (good statistics)

Author: Maya Ma

Editor: Jing Liong

Pictures: [[image:toshiba-hdd.jpg width="330" height="304"]]
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