Are of 2 kindsà
VOLATILE PERMENENT
VOLATILE(Primary mem):
When power is off the data is gone… e.g. RAM(buffer)…& ROM
PERMENENT(SECONDARY MEM/AUXILIARY STORAGE):
Not dependent on power, e.g., Hard disk… Also have following types…
[ MAGNETIC DISKS:
Data is stores in binary code as magnetic spots it’s of two types…
A. FIXEDàe.g. HD
B. INTERCHANGEABLEàe.g. FD(1.44" , 5.25"), ZIP DISK(4" 100 Mb), X DRIVE(2/3")…
[ MAGNETIC TAPES:
A:- Audio & vidio tape cassettes…
B:- Tape catridgh(1/2", 1/4")…
[ OPTICAL DISKS:
Use laser tech to read data…
A:- RO (Read Only)
B:- CD WORM (Written once Read many times)
C:- CD RW (Re writable)
I/O DEVICES
Functions both as input & output… e.g. FAX/Modem card, Terminal, Touch Sensitive Screen