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PRESENTED BY: HARSHITA THAKUR
WRO NO: 0467973
INFORMATION TECHNOLOGY TRAINING PROGRAMME

MEANING
Auxiliary storage, also known
as, secondary
storage, secondary
memory or external memory.
 USEFULNESS
Auxiliary storage device are
useful in transferring data or

• MAGNETIC TAPE
• HARD DISK
• FLOPPY DISK
• ZIP DISK
• JAZ DISK
• SUPEER DISK
• OPTICAL DISK
• DVD
• USB FLASH DRIVE

Magnetic tape is a magnetically coated
strip of plastic on which data can be
Encoded .
Tapes for computer are similar to the
tapes used to store music.

TYPE CAPACITY
Half Inch 60MB-400MB
Quarter Inch Cartridges(QIC
tapes)
40MB-5GB
8-mm Helical scan 1GB-5GB
4-mm DAT(Digital Audio
Tape)
2GB-24GB

 It’s a type of magnetic tape that uses the
same technology as VCR tapes.
The term helical scan usually refers to 8-
mm tapes, although 4-mm tapes (called DAT
tapes) Use the same technology.

This is type of magnetic tape it can
support Data transfer rates of2MBPS .
Digital audio tape
cartridge have the
greatest capacity.
They require expensive
tape drives and slow
data transfer rate.

Hard disk is a Magnetic disk
on which we can store
computer data .
Hard disk hold more data
and faster than floppy disks.
A hard disk store anywhere
from 10 MB to several GB.

A single hard disk usually consists of
several platters.
Each platters requires two read/ write
heads, for each side.
Each platter has the same number of
tracks .
A track location that cuts across all
platters is called a cylinder.

Floppy disk is a soft magnetic disk .
Floppy disk are slower to access , than
hard disk .
Floppy disk have less storage capacity
than hard disk .
Floppy disk are less expensive and are
portable.

 5.25 -
INCH -The common size for
PCs made before 1987. This type of
floppy is generally capable of storing
between100 KB to1.2 MB data.
Floppies come in two basic sizes :

3.5 INCH – Their small size , micro
floppies have a larger storage device
than their Cousins.
Storage capacity
of these floppy disk
100KB to 1.4MB of
data.

Zip disk developed by Iomega
corporation.
These disk are slightly larger
than floppy disk and twice as
thick.
Zip disk can hold 100mb of data.
Zip disk become a popular
media for backing up hard disk
and transporting large files.
ZIP DISK

Jaz disk drives developed by the
Iomega corporation .
Jaz drive has a 12-ms average seek
time and transfer rate of 5.5 MBPS
Jaz disk hold 1 GB storage capacity.

The design of the Super Disk
system came from an early 1990s
project at Iomega.
The super disk diskette can have
135 tracks that conventional 3.5 inch
1.44 MB diskette use.

CD-ROM(Compact Disc Read-Only Memory)
WORM (“Write-Once, Read–Many”)
ERASABLE
CD- R DRIVE (Compact Disk-Recordable Drive)
CD- RW DISKS (Compact Disk Rewritable disk)
DVDs (Digital Video Disk)

CD-ROM, which is pronounced as
‘see-dee-rom’.
CD-ROM is a type of optical disk.
The storage capacity of CD-ROM
up to 1 GB.
The most common
size is 630 MB.

CD-R DRIVE is a type disk drive.
CD-R DRIVE can create CDROMs
and audio CDs.
CD-R DRIVE can
also read CD-ROMs
and play audio CDs.

CD-RW Disk is short for CD–rewritable disk &
This is a a new type of CD Disk
That enables to write onto it in multiple sessions.
The frist cd-rw drive s became available
in mid 1997.
We can only write to them
once.

DVD is an optical storage device that
looks like the same as a CD.
But, It able to hold about 15 times as
much information and transfer to the
computer about 20 times fast as CD-
ROMs
Also called Super density
Disk.
It can hold 17GB of data..

 A USB flash drive, also known
under a variety of other names. (like
pen drive).
 Is a data storage device that
includes flash memory with an
integrated Universal Serial Bus
(USB) interface.
 USB flash drives are typically
removable and rewritable.

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