Hard disks, CD drives and DVD drives are known as IDE (Integrated Drive Electronics) devices. IDE devices are used to store data. Hard disks come in capacities of 20 to 750 GB. 1 GB = 1,000,000,000 bytes. Because PCs treat thousands as 1024, a 40 GB hard disk might be identified as having 37 GB = 40,000,000,000/1024 x 1024 x 1024. Good hard disks are available from Hitachi, Maxtor, Samsung, Seagate, and Western Digital.
Somewhat similar to the music stored on an audio tape, data is stored on a hard disc magnetically. The hard disk has one or two magnetically sensitive platters inside. When the hard disk is working, the platters are spun at a very high speed. The updraft from this motion allows a read-write head assembly to levitate over the platters. The drive mechanism moves the head assembly in the required positions to read or write data. When you switch off the PC abruptly or when the power goes off without warning, the head assembly does not get time to park itself safely away and instead crashes onto the platters. In serious cases, this renders the disk unusable - a crashed hard disk. Stellar Infomation Systems provides data recovery services and software for crashed hard disks.
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