Storage Devices

Question 1

Magnetic storage how it works

Answer 1

Tiny places are magnetised and those magnetised areas are 1

Question 2

3 types of storage media

Answer 2

magnetic, optical, solid-state

Question 3

Hard disk drive how it works

Answer 3

Data is stored on tracks and section of the track are called sectors
(magnetic)
Operating system uses FAT(file allocation table) to find where it is located and its order

Question 4

Adv hard disk drive

Answer 4

store large amounts
can access data randomly ( direct access)
low cost

Question 5

dis hard disk drive

Answer 5

physical knocks can corrupt data
slower to read/write than solid state
noisy

Question 6

2 types of hard disk drive

Answer 6

fixed ( in computer)
portable ( have own case)

Question 7

adv/dis of portable drive

Answer 7

portable
can share files easily
quick archiving of data
scheduled back ups

can get damaged
insecure ( get stolen)

Question 8

Magnetic tape

Answer 8

stored on a long line instead of around a disk
Must move through everything to get to end (serial storage)
used for stuff that is barely acessed

Question 9

sequential storage meaning

Answer 9

storing data in a order eg alphabetical

Question 10

Magnetic tape drive adv

Answer 10

cheaper than hard disk
huge data capacity
fast data transfer

Question 11

magnetic tape drive dis

Answer 11

long time to access data (need to go through everything)
when updating another tape is needed
affected by magnetic field

Question 12

which is faster

Answer 12

solid state>magnetic>optical

Question 13

which has more storage

Answer 13

Magnetic 1-2tb >solid state1tb > Optical
cd=700mb
DVD= 4.7 gb
Blu ray = 128gb

Question 14

durability

Answer 14

Solid state (portable) > Optical more portable than magnetic but large > Magnetic not portable because physical can damage disk

Question 15

reliability

Answer 15

Solid state(unaffected by magnetic field) >
Optical (reliable if not scratched) >
Reliable but affected by magnetic fields

Question 16

cost

Answer 16

optical low but lower
magnetic low (tape is cheapest)
Solid state ( more expensive but becoming cheaper)

Question 17

how does optical storage work

Answer 17

A laser is used to read and write data
The disk has one long track on it which has pits which reflect or disperse the light which it detected as 0s and 1s

Question 18

CD ROM/DVD ROM adv/dis

(read only memory)

Answer 18

can only be read from good for movie etc
portable ( risk of scratch thou)
less expensive than hard disk

less storage than hard disk or memory stick
slow data transer and access compared to hard disk
Read only so can’t add data

Question 19

CD R/ DVD R adv/dis how it works
(recordable)

Answer 19

Dye which can be burned to create unreflective spots

Cheaper than RW
Once burned behaves like ROM

can only be recorded once ( if error need to throw)
Not all CD/DVD player can read it

Question 20

CD RW/DVD RW adv/dis how it works
(rewrite)

Answer 20

has metal aloy that can be reflective or non reflective

data can be changed
less wasteful than R

possible to accidentally overwrite data
more expensive than other optical

Question 21

Bluray adv/dis

Answer 21

Uses blue/purple laser instead (more storage cause smaller wave lengths)
has encryption
larger storage than cd/dvd
faster transfer speed and access than cd/dvd

expensive compared to other optical

Question 22

Optical storage adv/dis

Answer 22

cheap
portable (just dont scratch)

less storage than hard disk
slow access speed
data degrades over time

Question 23

solid state drive (ssd)
how does it work

Answer 23

Uses flash memory
non volatile memory chips contain floating gate transistors which keep their charge after being turned off
when save operation begins changes to 0

Question 24

solid state drive adv

Answer 24

more reliable because no moving parts
small light and easily portable
quiet
faster access than disk

Question 25

solid state dis

Answer 25

more expensive than hard disk
storage is less than hard disk
limited read write cycles ( cant be used indefinitely)

Question 26

Flash memory card adv

Answer 26

small and durable ( no moving parts)
need little power
many sizes
can be used in camera computer phone

Question 27

flash memory dis

Answer 27

expensive compared to HDD
lower storage than hard disk
limited read write cycles
likely to lose/stolen