secondary storage

secondary storage

1. non-volitile

   • stores data even when the device is turned off.

2. magnetic

   • uses magnets to store data
     • represents binary digit north-1 south-0
   • HDD
     • high
       • capacity
         • stored in tiny particles so it can fit alot
       • reliablity
         • magnets take a long time to loose there charge
     • low
       • speed
         • HDD has to spin
       • price
         • cheep materials
       • portability
         • contains moving parts, it can't be moved
       • durability

3. opticle

   • data is stored in pits and hills.
     • lasers burn a pit in the device
       • lasers read the pits by reflecting a light.
         • the disk spins
   • DvD CD BluRay
     • high
       • portablility
         • small
       • durability
         • no moving parts
     • low
       • capacity
         • certain amount of pits in itelf
       • speed
         • has to be spin around and can't do that quickly
       • reliability
         • easily scratched
       • cost
         • cheep materials

4. solid state

   • research later

5. secondary data

   • capacity
     • speed
       • portablity
         • durability
           • reliability
             • price
               • how expensive the device is
                 • cost per gibabyte
             • how long the device can store data before it expires
           • how resistant the device is to damage
             • no moving parts means high durability
         • how easily the device can be moved around
       • how quickly the data can be accessed from or written from the divice
         • bits per second
     • the amount of data that can be stored