12 the storage capacity of a disk system is a

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Unformatted text preview: frame. 6. The storage capacity of a magnetic tape is a multiple of its data recording density and length. 7. A magnetic tape drive is used for storage and retrieval of data stored on magnetic tape medium. 8. A tape drive is connected to and controlled by a tape controller, which interprets the commands for operating the tane drive.200 I Foundations of Computing 9. The four commonly used types of magnetic tapes are i^-inch tape reel, V2-inch tape cartridge, Vi-inch streamer tape and 4-mm digital audio tape. 10. Magnetic disk is the most popular direct-access storage device. It consists of a thin, circular plate made of metal or plastic that is coated on both sides with a magnetizable recording material. The disk is stored in a specially design^ protective envelope or cartridge, or several of them may be stacked together in a sealed, contamination-free container. 11. The surface of a magnetic disk is divided into a number of invisible concentric circles called tracks. Each track is further subdivided into sectors. A sector is the smallest unit of data access from a disk. In case of disk units having multiple disk plates, a set of corresponding tracks on all the recording surfaces together form a cylinder. 12. The storage capacity of a disk system is a multiple of its number of recording surfaces, number of tracks per surface, number of sectors per track and number of bytes per sector. 13. The data access time for a disk depends on seek time, latency and transfer rate. The time required to position the read/write head over the desired track is called seek time. The time required to spin the desired sector under the head is called latency. Transfer rate refers to the rate at which data are read from or written to the disk. 14. A magnetic disk drive contains all the mechanical, electrical and electronic components for holding one or more disks and for reading or writing of information on to it. 15. A disk drive is connected to and controlled by a disk controller, which interprets the commands for operating the disk drive. 16. All types of magnetic...
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