Optical storage devices

Question 1

How do optical storage devices store data

Answer 1

on tiny bumps called data dots

Question 2

Maximum capacity of CD-ROM and DVD-ROM

Answer 2

CD-ROM=800mb
DVD-ROM=4.7gb

Question 3

Uses of CD-ROMs

Answer 3

storing small files like-; music tracks, audiobooks

Question 4

Uses of DVD-ROMs

Answer 4

storing bigger files like-; movies, computer games, enclyclopedias

Question 5

Advantages of CD-ROM and DVD-ROM

Answer 5

-Hold more data than floppy disks
-cheaper than hard disk drives
-data is read only(ROM) so it cant be accidentally erased
-portable

Question 6

Disadvantages of CD-ROM and DVD-ROM

Answer 6

-hold less data than hard disk drives or memory sticks
-cant edit the disks as they are read only

Question 7

Maximum capacity of CD-R and DVD-R

Answer 7

CD-R=700mb
DVD-R=4.7gb

Question 8

Uses of CD-R

Answer 8

-create personalised music playlists
-transferring data from one computer to another

Question 9

Uses of DVD-R

Answer 9

-storing recordings shot on video cameras
-backing up important data

Question 10

Advantages of CD-R and DVD-R

Answer 10

-once burned data cant be deleted
-cheaper than hard disk drives
-portable

Question 11

Disadvantages of CD-R and DVD-R

Answer 11

-only recordable once so impossible to update the disk
-if disk is damaged during burning it has to be thrown away
-not all CD/DVD players can read CD-R and DVD-R

Question 12

Maximum storage capacity of CD-RW and DVD-RW

Answer 12

CD-RW=700mb
DVD-RW=4.7gb

Question 13

Uses of CD-RW

Answer 13

-making editable playlists
-backing-up computer files

Question 14

Uses of DVD-RW

Answer 14

-recording tv programmes
-backing-up computer files

Question 15

Advantages of CD-RW and DVD-RW

Answer 15

-re-usable
-can be updated
-not as wasteful as CD-R

Question 16

Disadvantages of CD-RW and DVD-RW

Answer 16

-more expensive than CD/DVD-RW
-slow data transfer compared to hard disk drive

Question 17

maximum storage capacity of DVD-RAM

Answer 17

4.7gb or 9.4gb on double sided disks

Question 18

Uses of DVD-RAM

Answer 18

-used to archive video and data(reliable and long lasting)
-record tv programmes

Question 19

Advantages of DVD-RAM

Answer 19

-long lasting
-can read and write at the same time
-fast access to stored files
-large storage capacity

Question 20

Disadvantages of DVD-RAM

Answer 20

• doesnt work in many devices
  -expensive compared to other optical media

Question 21

Maximum storage capacity of blu-ray disks

Answer 21

100gb but also has 25gb and 50gb

Question 22

uses of blu-ray disks

Answer 22

-backing up hard disk drives in PC’s
-storing high quality movies

Question 23

Advantages of blu-ray disks

Answer 23

-huge storage capacity
-data can be read/transferred fast