Hard drive is a type of disk that is fixed, generally made of materials or disc-shaped metal plate. A hard drive typically consists from more than one plate or plates are coated with iron oxide. These plates called platters, each platter consisting of 2 sides. Because structure consisting of several disks, the disk has a capacity large storage. In addition it is also very high-speed hard disk with round 3600, 4500, 5400, 6300, 7200, 10000, 12000 rpm so acces data is also very fast. Some types of hard drives on the market that is hard drive used for laptops and PCs. PC hard drive technology that many outstanding currently consists of 4 types: IDE, SCSI, SATA, USB (Enclosure).
1GB = 1000Mb = 1.000.000 kb
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