1.3 storage

1.3 storage

Keywords
1. secondary storage
2. optical
3. magnetic
4. solid state
5. durabiltly
6. reliability
7. portability
8. capacity
9. speed
10. Storage
11. characteristic
12. estimate
13. overheads
secondary storage
1. long term storage of data, files and information
2. we need to store this so we can access it later and to use it later
3. we need secondary storage so programs wont reinstall every time we use it
4. when a device is not constantly connect connected to a computer
5. They are needed to back up data and for larger storage capacity
6. Advamtages
  1. Memory is non-volitale
  2. Data is not lost
Types of storage
1. Optical
  1. a laser light creates mark in a pattern on the disk
  2. advantages of optical
    1. cost
    2. portability
    3. durability
    4. capacity
  3. Most suitable for distributing a movie
    1. storage device for distributing for a movie is a DVD
2. Magnetic
  1. read/write move across the medium and change how magnetised that part of the medium is
  2. Advantages of magnetic
    1. capacity
    2. speed
    3. portability
    4. reliability
    5. cost
3. Solid State
  1. Made of microchips
  2. The state of the switches determine if a 1, or 0 is stored
  3. Advantages of solid state
    1. Portable
    2. Durable
    3. Fairly reliable
Characteristics of storage devices
1. Capacity
  1. how much data will it store
2. speed
  1. how fast can the data be accessed
3. Portability
  1. how easy is it to move it from one place to another
4. Durability
  1. how well does it last e.g if it was to be dropped
5. Reliability
  1. how consistently does it perform
6. Cost
  1. How much does it cost per KB, MB or GB
CD-ROM
1. Suitable for distributing music
  1. Can be read by other devices
  2. is read only, cant be over written
  3. cheap to produce
Magnetic tape
1. Slow to write and read
2. all the data has to be read before the data you want

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	Creado por Casey Morris hace alrededor de 7 años