memory and storage

Question 1

129 - what is virtual memory and why is it needed?

Answer 1

virtual memory is space on the computer’s secondary storage temporarily when the main memory is full.

Question 2

127 - what is ROM

Answer 2

Read Only Memory - holds programs used to start up the computer. it is non volatile and cannot be changed

Question 3

128 - what is RAM?

Answer 3

Random Access Memory - volatile memory that holds currently running programs. contents can be changed

Question 4

131 - describe optical storage

Answer 4

optical storage is a type of secondary storage which stores data on a spinning disk. data is read from and written to the disk using a laser.

Question 5

131 - describe magnetic storage

Answer 5

magnetic storage is a type of secondary storage which uses magnetic fields to store data

Question 6

131 - describe solid state storage

Answer 6

solid state storage is a type of secondary storage which uses flash memory to store data. they have no moving partsand are much faster than optical or magnetic storage

Question 7

131 - name the three common types of storage technology

Answer 7

optical, magnetic , solid state

Question 8

132 - what storage technology does HDD use

Answer 8

hard disk drives use magnetic storage technology

Question 9

132 - what storage technology does DVD use?

Answer 9

digital versatile disks use optical storage

Question 10

132 - what storage technology does CD use?

Answer 10

a compact disk uses optical storage

Question 11

what does volatile mean

Answer 11

memory is lost when power is switched off

Question 12

what does non volatile mean

Answer 12

memory is not lost when power is switched off and stays unchanged