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Hard Drive
A hard drive (or HDD: Hard Disk Drive) is a drive that stores data magnetically on multiple platters and offers random access to these platters which are located in the drive's housing.
The platters are concentrically (i.e., precisely) positioned one above the other and rotate in unison.
A read/write head is moved to the required position so that data can be read or stored (by magnetising the surface). The data remains stored there for very long periods, even after the computer has been turned off.
The maximum storage capacity of today's hard drives is constantly increasing: today an IDE hard drive can store over 75 GB of data.
Hard drives are connected to the computer over interfaces such as IDE (more economical, for users) and SCSI (expensive, fast, appropriate for servers).
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