1.1.3 Input Output Storage

Question 1

Optical Storage

Answer 1

Disc either relfects or scatters
Pits: Scatter, 0
Lands: Reflect, 1
Written in spiral tracks

Question 2

CDs

Answer 2

“Compact Disc”
Audio, text, images

Question 3

DVD

Answer 3

“Digital versatile disc”
Higher storage capacity than CDs

Blu-Ray
5x as much storage as DVD

Question 4

Magnetic

Answer 4

Polarised or unpolarised (2 magnetic states)

Question 5

HDD

Answer 5

High capacities
Rotate magnetic platters under a read/write head on actuating arm
+ High storage (500GB - 1TB)
- Damaged by movement
- Slow transfer

Question 6

Magnetic tape

Answer 6

Passed through readers

Question 7

Floppy Disk

Answer 7

Portable, enclosed in plastic, 1MB

Question 8

Flash

Answer 8

() Silicon semiconductors form NAND and NOR gates
() Stores electircal charge in high or low
() Non-volatile

+Light and portable
+ No moving parts
+ Higher transfer
- Cost

Question 9

RAM and ROM

Answer 9

RAM:
() Used to store programs currently in use
() Volatile

ROM:
() Non-volatile
() Cannot be modifiedStores bootstrap routine

Question 10

Virtual Storage

Answer 10

+ Protection from disaster
+ Can be accessed from elsewhere
+ No physical space needed
+ No limit on size