Storage devices and media

Question 1

Define CD

Answer 1

Compact discs

• Access time is slower than a hard disk
• Easily damaged but not expensive

Question 2

Define DVD

Answer 2

Digital versatile disk

Question 3

Describe CD-ROM and DVD-ROM

Answer 3

Data can be read from but not written.

Used to prevent the deletion of data(e.g, distribution of software, music)

Question 4

Describe CD-R and DVD-R

Answer 4

• Allow data to be written to them on one occasion only; after this, the data can only be read.

Question 5

Describe CD-RW and DVD-RW

Answer 5

Can be written to repeatedly up to around 1000 times, used for continuously backing up data or archiving.
Data can recorded on them can be deleted.

Question 6

Describe Bluray

Answer 6

High definition DVD format supported by a group of manufacturers led by Sony

Question 7

Describe RAM

Answer 7

Random-access memory can be written to,read from and edited.

Volatile(cleared when the computer is switched off)

Question 8

Describe ROM

Answer 8

Read-only memory, can be accessed in random order, but the data in it cannot be changed
Non-volatile

Question 9

Describe flash memory cards

Answer 9

A form of electrically programmable read only memory, uses to store photos on digital cameras

Question 10

Pros of flash memory cards

Answer 10

• very compact

- very robust

Question 11

Cons of flash memory cards

Answer 11

• expensive compared to hard drive disks

- lower storage capacity than hard disk