Secondary Storage

Secondary Storage

1. Optical Storage

   • Example devices
     • DVD
     • CD
     • BlueRay
   • Definition
     • This data is recorded by making marks in patterns on an optically readable device typically read by lasers
   • Characteristics
     • CAPACITY - Up to 25 GB
     • SPEED - 50 Mbps
     • PORTABILITY - Yes
     • DURABILITY - Decade over time
     • RELIABLE - Decades over time
     • COST - 25 GB / £0.44

2. Magnetic Storage

   • Definition
   • Example Devices
     • Hard Disk Drive
     • Magnetic Tape
     • Floppy Disk Drive
   • Characteristics
     • CAPACITY - Up to 6 TB
     • SPEED - 3 Gbps
     • PORTABILITY - Yes
     • DURABILITY - Can be damaged if moved
     • Reliability - Extremely
     • COST - 3TB / £4.85

3. Solid State

   • Characteristics
     • CAPACITY - Up to 3 TB