Page 73 - DCAP101_BASIC_COMPUTER_SKILLS

Basic Computer Skills

Notes 11. Magnetic-Ink Character Recognition (MICR)

12 Bar Code Reader (BCR)

In current market there are many local devices are available so never
take local devices.

4.4 Latest Output Devices in Market

1. Monitor
2. Compact Disk
3. Printers
4. Speaker
5. Disk Drives

7. Floppy Disk
8. Headphone
9. Projector

Journey of the Evolution of Secondary Storage

o you remember the last time you used the FDD drive of your computer, and
for what? Chance is if you have used it then it would be for some emergency
D booting of the computer, or for recovery of your broken OS. In summary, you
would have not used it as a data transfer or storage medium.
Currently this magnetic medium is fast getting replaced by the Flash Rom drives that
we also know by Pen Drive or USB Drive. This new medium is killing the old magnetic
medium for its reliability, speed and ever growing capacity.

Historically the secondary storage is always in the realm of change. Technology and
needs are always pushing the medium smaller, faster, more reliable, secure and of
expanding capacity. Just like some 10 years back the 5.25" dives were replaced by this
3.5" drives for smaller size and larger capacity.

History

History of secondary storage is quiet interesting, as it has seen the use of papers to silicon
to optical medium. With each generation it gets better, faster and smaller is size and
always increasing the storage capacity.

Paper Punch Card
Paper Punch cards used initially as the first external storage device. It used paper card/
roll with holes as data. Meaning a hole was zero, and no hole was one. Programmers
Contd...

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