Computer Science · May / June 2021 · Paper 12 · Question 2

0478

As printed in the paper

The question as text

Data storage can be magnetic, solid state or optical.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

2(a)[6]
One mark per each correct row.
Magnetic
Solid
Optical Statement
(✓)
state
(✓) (✓)
no moving parts are used to store data
pits and lands are used to store data
data is stored on platters
flash memory is used to store data
parts are rotated to store data
data can be stored permanently
2(b)(i)[1]
Any one from:
Hard disk drive // HDD
Magnetic tape
2(b)(ii)[1]
Any one from:
CD
DVD
Blu-ray disk
2(b)(iii)[3]
One for type of storage, two for matching justification from:
Magnetic // HDD
(Web server) is likely to receive many requests a day
(Web server) will likely need to store a lot of data and magnetic is high capacity
Magnetic is cheaper to buy for storage per unit than solid state
Magnetic is capable of more of read/write requests over time // has more longevity // SSD has more limited number of read/write requests (before it is no longer usable)
No requirement for it to be portable, so moving parts does not matter
Solid-state // SSD
(Web server) is likely to receive many requests a day
(Web server) will likely need to store a lot of data and solid-state is high capacity
Solid-state is more energy efficient
Solid-state runs cooler so will not overheat
Solid state has faster read/write speeds to handle volume of traffic
2(c)[3]
Any three from:
Data is flashed onto (silicon) chips
Uses NAND/NOR technology // can use flip-flops
Uses transistors/control gates/floating gates …
… to control the flow of electrons
It is a type of EEPROM technology
When data is stored the transistor is converted from 1 to 0 / 0 to 1
Writes (and reads) sequentially

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