IT lecture 5 - Information Technology Information Storage...

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Information Technology Information Technology Storage Devices Storage Devices Prof. Adnan Khalid Prof. Adnan Khalid
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Storage Devices Storage Devices In many cases the information that has been processed is stored in machine- readable format so that it may be accessed at a later time by a computer. This data is stored in binary form in 'bits'. This practice requires the use of storage devices. Storage Devices: Hard Disk Magnetic Tape Floppy Disk Optical Disk Punched Cards USB Flash Drive Zip Disk Multimedia Cards
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Hard Disk Hard Disk The hard disk is a direct-access storage medium with a rigid magnetic disk. The data is stored as magnetized spots arranged in concentric circles (tracks) on the disk. Each track is divided into sectors. The number of tracks and sectors on a disk is known as its 'format'.
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Hard Disk High data rates demand that the disk rotates at a high speed (about 3,600 rpm). As the disk rotates read/write heads move to the correct track. The disk is sealed and lubricated and the head hovers on a cushion of air just above the disk to avoid damage. These are therefore called floating heads. The storage capacity of a hard disk can be Gigabytes (Gb), i.e. thousands
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This note was uploaded on 04/07/2012 for the course BUSINESS 1005 taught by Professor Mali during the Spring '09 term at CSU Channel Islands.

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IT lecture 5 - Information Technology Information Storage...

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