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  • Groups

  • Raghav and Ishita

  • Sanjoni and Saurabh

  • Garima and Ragini

  • Anmol, Janaki and Shauraya

The British School, N.Delhi



Measuring unit
Measuring Unit

  • BIT( Binary Digit)

  • Byte ( 1 Byte=8 bits)

  • 1 KB=1024 bytes

  • 1 MB=1024 KB

  • 1 GB = 1024 MB


Ram random access memory
RAM- Random Access Memory

  • Also known as Volatile Memory, Main Memory and Intermediate Access Storage.

  • Working memory.

Switch off

Welcome here.


Rom read only memory
ROM- Read Only Memory

  • Firmware – instructions that tells computer how to load Operating system

  • Types – PROM ( Programmable read only memory)

  • EPROM( Erasable Programmable read only Memory)


Secondary storage devices
Secondary Storage Devices

  • Magnetic Storage Devices (Floppy Disk, Hard Disk, magnetic Tape)

  • Optical Storage Devices ( CD, DVD)

  • Removable Storage Device ( Pen Drive, Zip Drive, Jaz Drive)


Floppy disk
Floppy Disk

1.44 MB of Storage Capacity


What happens when a disk is formatted
What happens when a disk is formatted?

  • All data is erased ( Quick Format)

  • Surfaces are checked for physical and magnetic defects and tracks and sectors are created again. ( Full Format)


Hard disk
Hard Disk

Seek Time

Rotational Time

Access Time



Magnetic tape structure
Magnetic Tape- Structure

R1

R2

R3

R4

R5

R6

R7

R8

R9

R10

F1

F2

Inter

Block

Gap-

IBG

F3

F4

F5

F6

F7

F8

F10

Block


Magnetic tape ibg
Magnetic Tape- IBG

  • An Interrecord gap is a break between data records on magnetic tape that serves as a safety margin for data overwrites.


Optical storage devices cd
Optical Storage Devices- CD

  • CD-R

  • CD – RW

  • Other backup Devices like USB Drive, Jaz Drive and Zip Drive.


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