secondary storage

secondary storage

1. optical

   • Optical storage is where you put marks on a disk which make a pattern on a disk that a computer can read.
   • example devices
     • CD
     • blu-ray
     • DVD
   • capacity- DVD 4.7GB, CD 720MB, blu-ray -25GB
   • 44p for 25GB

2. magnetic

   • uses different magnetisms on a disk to show data
   • example devices
     • hard disk drive
     • magnetic tape
     • floppy disk drive
   • largest capacity (6TB)
   • £85 for 3TB

3. solid state

   • most expensive
   • portable
   • fastest (50GB)
   • example devices
     • USB memory stick
     • ssd
   • £40 for 128GB