Computer storage

Computer storage

1. Optical

   • Cd's and DVD's
     • Blu-ray
   • A laser creates marks in a pattern on the disk
   • A laser light detects where the marks are and translates this into a readable format

2. Magnetic

   • Hard disc drives and tape drives
   • Read or write move across the medium and change how magnetised that part of the medium is

3. Solid State

   • Solid disk drive and SD and USB cards and sticks
   • This is made of microchips
   • The state of the switches determine if a 1 or 0 is stored