This preview shows page 1. Sign up to view the full content.
Unformatted text preview: round, flat piece of flexible plastic coated with magnetic oxide. It is
encased in a square plastic or vinyl jacket cover. The jacket gives handling protection to
the disk surface. Moreover, it has a special liner that provides a wiping action to remove
dust particles that are harmful for the disk surface and the read/write head. Floppy disks
are so called because they are made of flexible plastic plates which can bend, not hard
plates. They are also known as floppies or diskettes. They were introduced by IBM in
1972 and are now being produced in various sizes and capacities by many manufacturers.
A. floppy-disk drive is a device that is used to read/write data from/to floppy disks. The
drive has a spindle that rotates the disk, and read/write heads that can move in and out to
position the read/write heads on any track of the disk surface. It is of the interchangeable
magnetic disks type. That is, it allows the loading and unloading of magnetic disks as and
when they are needed for reading/writing data on to them. A floppy disk can be very
easily loaded into or unloaded from a floppy-disk drive just by slipping the disk inside
the drive's slot or by pressing the eject button on the drive. The disks are loaded into the
disk drive along with the jacket cover and data are read/written through an aperture in the
jacket (see Figure 8.19). Unlike the hard-disk drives, the read/write heads of a floppy- disk drive make direct contact with the disk surface during the process of reading or
writing. Hence floppy disks get worn out with constant use. Manufacturers guarantee
about 2 million reads of a floppy disk track. In case of currently used floppy-disk drives,
the rotational speed of a floppy disk is of the order of 300 to 400 rpm, and the data
transfer rate is of the order of 10 to 30 Kilobytes/second.
Types of floppy disks
Although floppy disks and their corresponding drives are available in many sizes and
capacities, the two types in widespread use today are the 5'/4-inch and the 3'/2-inch
diskettes. They artrbriefly described below.
1. The 5%-inch diskette. It is a floppy disk of 5V4-inch diameter. The disk is encased in a
View Full Document
This document was uploaded on 04/07/2014.
- Spring '14