Secondary storage

Secondary storage

1. Optical

   • Examples
     • DVD
     • Blu-Ray
     • CD
   • Data on an optically readable medium
   • There isn't loads of storage. The speed id 50Mbps. It is portable. The durability and reliability degrades over time. It costs 25GB/44p.

2. Magnetic

   • Examples
     • Magnetic tape
     • Floppy disks
     • hard disk drives
   • Uses different patterns of magnetisation to store data.
   • There is up to 6 TB of storage. The speed is 3 Gbps. It isn't portable. It can be damaged if dropped. It is extremely reliable. The cost is 3TB/£40

3. Solid state

   • Examples
     • Memory stick
     • Memory card
     • Smart cards
   • Uses only electronic circuits, without any moving mechanical parts