Secondary Storage

Secondary Storage

1. Optical

   • CD - R
     • Properties
       • You can only write data to CD-R once
       • Store about 700mb of data
   • DVD-R
     • Properties
       • a DVD which can be write too once only.
       • capacity of 4.7 GB
   • DVD - ROM
     • You can only read the data on disc not write to it
   • DVD-RW
     • Save data to disk over and over again
     • Data can be edited and deleted and over written
   • CD ROM
     • Read only and cannot write to disc or save to disc
     • 700 mb storage capacity
   • CD RW
     • Write to disc many times edit data many times
     • 700 mb capacity