Secondary Storage

Secondary Storage

1. Optical

   • definition
     • Optical storage is something that Stores data on an optically readable medium
   • characteristics
     • speed
       • capacity
         • DVD: 4.7 GB
           • CD: 720 MB
             • Blu-Ray: 25 GB
       • portability
         • durability
           • reliability
             • cost
               • 25 GB/£0.44
             • Decays over time
           • Decays over time
         • Good
       • 50 MBPS

2. Solid State

   • definition
     • solid state drives don't have any moving parts hence their name. It also uses flash memory to store it's data.
   • characteristics
     • speed
       • portability
         • durability
           • reliability
             • cost
               • 128 GB/£40
             • Extremely reliable
           • Very Good
         • Good
       • capacity
         • up to 240 GB
       • 60 GBPS

3. Magnetic

   • definition
     • Magnetic storage is one of the most affordable ways to store large amounts of data and has been implemented using magnetic tape, floppy disks and hard disk drives.
   • characteristics
     • speed
       • capacity
         • 6 TB
       • portability
         • durability
           • reliability
             • cost
               • £85
             • Extremely reliable
           • Can be damaged if moved
         • Bad
       • 3 GBPS