This document discusses different types of storage devices. It begins by explaining that storage devices are used to store data even when a computer is turned off. It then provides details on various storage media like audio cassettes, video cassettes, VCRs, floppy disks, CDs, DVDs, and USB drives. For CDs and DVDs specifically, it describes their structure, read/write speeds, storage capacities, advantages like portability and large storage, and disadvantages like slow writing speeds. The document emphasizes that storage devices allow easy transfer of data and files between computers.

1. CD-ROM, CD-R, DVDCD-ROM, CD-R, DVD
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2. Storage
Devices..?
Storage
Devices..?

3. Storage Devices
• The storage devices store
data –even when the
computer is turned off.
• It is used to keep important
data and files which are of
regular use on permanent
basis.

4. Audio CasetesAudio Casetes

5. Video Casetes

6. VCRVCR

7. Floppy DiscFloppy Disc

8. Floppy DiskFloppy Disk
Floppy Disk –is a removable disk
that everyone is familiar with. Since
it has a small capacity, it is typically
used to store documents so that
they can be used on more than one
computer.

10. CD A audioCD A audioCD A audioCD A audio

11. Video CDVideo CDVideo CDVideo CD

12. CD Structure
• A CD is flat, round, portable metal disc,
which is coated with a thin metal or plastic.
• It is usually 0.75 inches in diameter.

14. 
Compact Disc - read only memory (write
once)

Data is encoded and read optically with a
laser

Can store around 600 and 700 MB data

Compact Disc - read only memory (write
once)

Data is encoded and read optically with a
laser

Can store around 600 and 700 MB data

15. :-Compact Disc read-only memory is a Compact Disc that
contains data accessible by a computer.
•Firstly the Compact Disc format was designed for music
storage and playback,
•Later the format was adapted to hold any form of binary
data.
CD-ROM

16. •CD-ROM are popularly used to distribute computer
Software, including games and Multimedia
applications, though any data can be stored (up to
the capacity limit of a disc). Some CDs hold both
computer data and audio with the latter capable of
being played on a CD player, whilst data (such as
software or digital video) is only usable on a
computer (such as PC CD-ROMs. These are called
Enhanced CDs.

17. Reading Speed
• Reading speed is measured in kB/s
• Reading speed determines the transfer of
data in one second.
• 1× or 1-speed which gives a data transfer
rate of 150 kB/s in the most common data
format.

18. Advantages of CD-ROM
• Large storage space
• Compact and light
• Can be manufactured on a large
scale
20

19. Disadvantage Of CD-ROM
• Slow Writing speed
• Not easily re-writable
• Cost Concerns
21

20. Summary
• Compact Disk is a type of optical storage.
• It holds data through physical marks.
• Its is played in a CD-Player, and is read at
different speeds.
• Files system is required to write data on
CD by different methods.
• CDs are compact storage devices that can
be moved from on place to another easily.

21. CD-Room

22. CD-R

23. CD-RW

25. DVDs (Digital Versatile
Disc or Digital Video Disc)
DVD, is an optical disc storage
media format, and was invented
in 1995. Its main uses are video
and data storage. DVDs are of the
same dimensions as compact
discs (CDs), but store more than
six times as much data.
DVD, is an optical disc storage
media format, and was invented
in 1995. Its main uses are video
and data storage. DVDs are of the
same dimensions as compact
discs (CDs), but store more than
six times as much data.

26. DVD-RDVD-R

27. DVD-RWDVD-RW

28. DVD-ROOMDVD-ROOM

29. Development day by dayDevelopment day by day

30. USB (Universal serial Bus)USB (Universal serial Bus)

31. USB 2.0 V/S 3.0USB 2.0 V/S 3.0

32. DownloadingDownloadingDownloadingDownloading

33. Need of ThinkingNeed of Thinking