1.3 storage

1.3 storage

1. secondary storage

   • long term storage of data,software and OS
   • USB sticks
   • to access things again later
   • without it software would need to be installed every time it is used

2. optical

   • laser read and writes disk
   • pits around the disk store data in binary
   • DVD
   • CD
   • Blu ray

3. magnetic

   • lelvels of magnetism will determin whether it is a 1 or a 0
   • cheap
   • high capacity
   • can be manipulateed or corrupted by a magnetic field
   • can be internal
   • can be portable
   • hard disk drive
   • tape drive

4. solid state

   • Durable
   • no moving parts
   • sometimes called flash memory
   • retains an electrical charge using logic gates
   • solid state drives
   • SD card
   • USB memory sticks

5. durability

   • how rough can you use it without it breaking

6. reliability

   • how consistently it performs

7. portability

   • how easy is it to move around from place to place

8. capacity

   • how much data it can store

9. speed

   • how fast can it retrieve data

10. cost

    • how expensive it is

11. data capacity

    • GB
      • 1b bytes
    • MB
      • 1m bytes
    • KB
      • 1024 bytes
    • byte
      • 00,000,000
    • nibble
      • 0,000
    • bit
      • 0