1.3 Revision

1.3 Revision

1. Primary Storage = made up of RAM/ROM direct from CPU.

2. Secondary storage = not direct from CPU.

   • Optical Storage
     • uses laser lights to retrieve data from the surface of optical data such as cd's and DVD's
     • ROM
     • (R) Recordable
     • (RW) Rewritable
       • Optical discs are prone to scratching which can cause data loss and rewritable (RW) discs are particularly unreliable for long-term storage due to the stability of the chemicals that they are made from.
     • cheap and quick to produce in large numbers
     • cheaper per GB however smaller capacity than USB flash drives

3. Magnetic hard disk drives.

   • Relatively large capacity and low price per gb. provide reasonably fast transfer rates (120mb per second)
   • Generally reliable, they keep working for a long times however they develop faults due to the wear and tear of the moving parts. They can be damaged easily and are not very robust. (meaning it does not stay healthy for long)

4. SSD's

   • advantages
     • excellent speed
     • very robust
     • portable
   • made of flash drives
     • contain no moving parts
     • faster transfer rates
   • disadvantages
     • higher cost per GB rate than Magnetic Hard Disks
     • can only be rewritten a limited number of times
     • reduced durability than Magnetic Hard Disks

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