revision 7.2

revision 7.2

1. different types of hardware

   • solid state
     • advantages
       • high speed of data tranfere and low consumtion
       • compact and protable
     • disadvantages
       • much more expensive per unit
       • more vunrable to sudden power loss
     • they are non-volatile so they store data forever
   • optical
     • disadvantages
       • it is more expensive than a DVD and requires a blu-ray player
       • if scratched it may lose data
     • advantages
       • they are portable
       • it can hold a lot more data than a standard DVD
     • optical devices use lasers to scan a spinning disk made with metal and plastic
   • magnetic
     • disadvantages
       • although it is fast, it has slower access than solid state drives
       • it can easily break and over time will slow down and break
     • advantages
       • fast to access and retrieve data on compared to other storage devices
       • it is fairly cheap
     • magnetic devices are usually used to backup important files and for long term storage