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6. The storage capacity of a magnetic tape is a multiple of its data recording density and
7. A magnetic tape drive is used for storage and retrieval of data stored on magnetic
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
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
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
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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This document was uploaded on 04/07/2014.
- Spring '14