1.3 storage

1.3 storage

1. secondary storage

   • long term storage ofdata,files,software,OS
   • why do we need to store these things?
     • to access it again
     • to use software
     • to interact
   • what would happen is we didn't have secondary storage?
     • software would need to be installed every time we used it
       • you cannot save any data or files

2. Optical storage

   • a laser light creates marks in a pattern on a disk
   • a laser light detects where the marks are and translates it into a readable format

3. Magnetic storage

   • move across the medium and change how magnetised that part of the medium is
     • E.g one level of the magnetism will be a 1, a second will be 0

4. Solid state

   • this is made of microchips (switches)
   • the state of the switches determine if a 1, or 0 is stored

5. Data capacity

   • traditionally 1KB = 1,024 bytes
   • GB
   • Byte
   • MB
   • Nibble
   • Bit

6. Characteristics of a storage device

   • capacity
   • speed
   • Portability
   • Durability
   • reliability