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slide1

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.