COMPUTER DISK DRIVES

DISK DRIVES

The internal fixed disk is called hard disk and one or two A,B are external disk drives ,for floppy disks ,the floppy disk may be of 5.25*5.25 inches or 3.5*3.5 inches in size with varying the capacity.
PRINTER
Printer is used to print the result on the paper ,it is an output devices ,there are many types of printer according to the types of printer the speed and printing capacity of printers are also different ,different types of printers are dotmatrix printer ,laser printer ,inkjet printer,line printer etc.
SECONDARY STORAGE DEVICES:
Programms or data cn be stored into these devices permatnently in the computer whenever it is required .ex. of secoundary storage devices:
-floppy disk
-hard disk
-magnetic tape.
FLOPPY DISK:
It is made up of a plastic plate coated with magnetic substances and has concentric circles called tracks and sectores varies from the capacity of disk.
floppy disks ar eone of the most common portable devices in computer system which cab be used to carry the information or data fromone computer to another .
HARD HISK:
It is used as input and output storage media ,it is made up of more than one plastic plate coated with magnetic substaances and fixed on an axix within a metal case so it is called fixed disk also ,hard disk is used to store a large no. of dta ,now adays most of the microcomputers has used the hard disk ,the capacity of the hard disk varies as 10 mb,40 mb,270mb,640 mb,1gb,2.1 gb etc.
the unite of memory is expressed as
1 alphabets or character- 1 bits
4bits - 1 nibble
8 bits -1 byte
1024 byte -1kb
1024 mb -1mb
1024 mb -1gb
1024 gb -1tb