Question

table 1.3 storage devices: advantages and disadvantages (continued)
storage\tadvantages\tdisadvantages
optical storage\t\t
cd - rom (compact disk read - only memory)
storage capacity: 650 mb\tvery cheap to produce, particularly on a large scale
good way of distributing software
possible to add data (write) to the cd - r in more than one session\tas cd is read - only, data cannot be changed or deleted
slower access times than hard drives
should have a cd - r recorder to write to a disk
cd - r (compact disk recordable)
storage capacity: 650 mb\tgood for backing up files\tcd - r software has varying capabilities
should have a cd - rw recorder to write to a disk
cd - rw (compact disk rewritable)
storage capacity: 650 mb\tcd - rw can be erased and reused as many times as required
good for backing up files
excellent for showing video\tcd - rw does not work in all cd players
dvd (digital versatile disk)
storage capacity: 4.7 gb up to 17 gb\tas with cd - r and cd - rw, there is a range of ways of writing (storing) data on dvd\thas replaced cds, producing better quality videos than cd - roms
dvds do not work in cd - rom drives
blu - ray
storage capacity: 25 gb up to 100 gb\tblu - ray was intended to replace the dvd. main use is for distribution of feature films and video games
can be viewed in a high - definition resolution\trequires a blu - ray player or optical drive
more expensive than cds and dvds
questions
1 state the general name for the type of storage that saves programs and data permanently.
2 list three categories of local storage.
3 what is the main use of magnetic tape?
4 what type of secondary storage is most suitable for use in digital cameras and mobile phones?
5 explain one advantage of, and one concern associated with using cloud - based storage.

Explanation:

Step1: Analyze question 1

The type of storage that saves programs and data permanently is non - volatile storage.

Step2: Analyze question 2

Three categories of local storage are hard disk drives, solid - state drives, and optical storage.

Step3: Analyze question 3

The main use of magnetic tape is for long - term data archiving.

Step4: Analyze question 4

The most suitable secondary storage for digital cameras and mobile phones is flash memory.

Step5: Analyze question 5

Advantage of cloud - based storage: Easy access from multiple devices. Concern: Security and privacy issues.

Answer:

1. Non - volatile storage
2. Hard disk drives, solid - state drives, optical storage
3. Long - term data archiving
4. Flash memory
5. Advantage: Easy access from multiple devices. Concern: Security and privacy issues