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ict > chapter 3- storage devices and media > Flashcards

chapter 3- storage devices and media Flashcards

1
Q

whatre the features of secondary storage (3)

A

-nonvolatile storage devices
-permanent data store
-larger memory store than RAM and ROM

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2
Q

what does volatile mean

A

data is lost after the device is turned on

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3
Q

what 4 things does secondary storage store in general

A

-applications
-operating systems
-device drivers
-general files

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4
Q

whatre the 3 categories of secondary storage

A

optical magnetic and solid state

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5
Q

why do we use secondary storage devices

A

to store or backup data(copy data from 1 media to another)

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6
Q

what is a storage medium

A

the physical device where data is stored

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7
Q

in what form do magnetic tape drives store data in

A

analouge, 0 for demagnitised and 1 for magnetised

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8
Q

what are the 2 most commonly used magnetic devices

A

magnetic tape drives and hard disk drives

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9
Q

how do magnetic tape drives work

A

data stored in analouge in different magnetic signatures which allow read and write heads to read and write data,
-tape moves over the heads(incuced magnets that magnitise tape to write data and be attracted to magnet to read data

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10
Q

whatre the 3 uses of magnetic tapes

A

-in batch processing
-backups of data for long term storage
-daily backups in companies with large amts of data

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11
Q

whatre the advantages of magnetic tapes

A

-less expensive per byte than ssd or hdd
-durable technology
-large storage capacity
-good data transfer(time taken to transfer data) rate

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12
Q

whatre the disadvantages of magnetic tapes

A

-have a slow data access time(time taken to find data)
-updating data needs a new tape to be produced which is a long process that introduces errors
-affected by magnetic fields

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13
Q

how do hard disk drives work

A

acutators are used to move the readwrite heads during operation

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14
Q

what are the 2 uses of hard disk drives

A

-storing operating systems,system software,apps and data
-website servers n file servers are used in real time

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15
Q

whatre the advantages of HDDs

A

-very fast data transfer rate
-large storage capacity
-tried and trusted tech which makes them suitable for website and cloud servers

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16
Q

whatre the disadvantages of HDDs

A

-slow data access time and suffer from latency(time taken for block of data to rotate around head)
-easily damaged
-many moving parts that can wear out
-affected by magnetic fields
-noisy due to high speed spinning disks

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17
Q

what are portable hard disk drives

A

they work the same as fixed HDD devices and are used to back up and allow data transfer between computers

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18
Q

how do optical media devices work

A

they use lasers to read and write data onto plastic disls which reply on properties of chemical dues and metal alloys to store analouge data

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19
Q

what are the features of cd and dvd

A

they use red laser ligjt to read from and wrote on the optical disk
data is stored in pits and lands on spiral tracks
dvd has larger storage can cd

20
Q

whatre the 2 data access ways

A

serial and direct

21
Q

what is serial access

A

data is read sequentially in the same order it was written in,used by magnetic tape

22
Q

whats direct access

A

data instantly read from required location without followung hierarchy,ex bluray dvd and flash drives

23
Q

what are CD-r and DVD-r

A

can only be written to once then become rad only,used for home audio and video recordings,used for data storage

24
Q

whatre the advantages of CD-R and DVD-R

A

cheaper than RW DIRKS and permanent storage medium

25
Q

whatre the disadvantages of CD-R AND DVD-R

A

recording is done only once and if error is made its thrown away

26
Q

what are CR-RW and DVD-RW

A

can we written and read to erased and rewritten many times,used to record tv programs

27
Q

whatre the advantages of CR-RW and DVD-RW

A

can be reused many times,can store different file formats,not wasteful

28
Q

whatre the disadvantages of CR-RW and DVD-RW

A

expensive technology,data can be accidentally overwritten

29
Q

what are CD-ROM and DVD-ROM

A

read only memory so you cant edit only read disks,store permanent data to prevent deletion or copying,used for films files and software

30
Q

whatre the advantages of CD-ROM and DVD-ROM

A

less expensive than hdd,permanent storage

31
Q

whatr ethe disadvantages of CD-ROM and DVD-ROM

A

slower data transfer rates and access time compared to hdd

32
Q

whatre the 4 features of blu-ray disks

A

-data read from or written to using blue laser lught,
-store more data than dvd due to a smaller pits and lands and use of bluelight,
-have secure enyption systems to ensure copyright,
-used in movies and backup

33
Q

whatre the advantages of blu-ray disks

A

-large storage capacity
-fast data transfer rate and access speed
-secure encryption

34
Q

whatre the disadvantages of blu-ray disks

A

-expensive
-encryption challanges when used to store videos

35
Q

whatre the 3 features of solid state drives

A

-store data in 1s and 0s in tiny transistors bt moving electrons within chips
-used for backing up and storung files
-mainly used in laptops smartphones

36
Q

whatre the advantages of ssd

A

-no moving parts
-consume less power
-fast access time

37
Q

whatre the disadvantages of ssd

A

-limited durability
-expensive per GB

38
Q

whatre the 2 features of pen drives

A

-small lightweight and portable SSD devices used for file transfer and backup
-used as security devices

39
Q

whatre the advantages of pen drives

A

-small,lightweight and postable
-durable
-not affected by magnetic fields

40
Q

whatre the disadvantages of pen drives

A

-easy to lose due to small size
-could get damaged or corrupted if its not ejected

41
Q

what are the 3 forms of memory cards(use ssd technology)

A

-SD cards common in portable devices
-XD cards )used in degital cameras)
-Cfast card(used high-end cameras)

42
Q

whatre the advantages of memory cards

A

-compact and can be removed easily
-durable with no moving parts

43
Q

whatre the disadvantages of memory cards

A

-expensive per gb
-short life span due to limited read and write operations

44
Q

what is cloud storage

A

the sorage of data in a remote location online that makes use of servers accessed through the internet

45
Q

whatre the advantages of cloud storage

A

-data can be accessed anywhere with a internet connection
-storage space can be upgrades easily without buying hardware
-automatic data backup after every entry
-larger storage capacity
-data can be shared with many people

46
Q

whatre the disadvantages of cloud storage

A

-data can be hacked
-lack of internet limits data access
-data can be sold to 3rd party
-expensive
-user has no complete control over data

ict (16 decks)

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