Secondary storage

Secondary storage

1. solid state

   • uses microchips to store data,not magnetised disks.
     • doesn't contain any moving parts.
   • stores data permentaly.
     • always there unless the user decides to delete it.
   • examples:
     • USB stick
     • SD card
   • Advantages:
     • very durable
     • can read and write data fast
     • faster than magnetic storage
     • energy efficient
   • disadvantages:
     • has a limited read/write lifespan
     • less cost effective
     • has much smaller capacity than magnetic storage

2. Magnetic storage

   • data is stored by magnetising the surface of platters
     • platters are flat, circular plates.
     • platters rotate at a very fast speed.
   • Advantages:
     • cost effective.
     • larger capacity compared to solid state.
   • disadvantages:
     • not very durable.
     • many moving parts.
     • reads/writes data slower comapred to solid state.
   • examples:
     • CD drive
     • Hard drive
     • Floppy disk

3. optical storage

   • is any storage method.
     • data is written and read with lasers.
   • examples:
     • CD's
     • DVD's
     • Blu-Ray
   • Advantages:
     • cost effective.
     • very portable.
   • Disadvantages:
     • not very durable.
     • has a limited capacity.

4. non volatile storage needed to store data