computer science storage devices revision

computer science storage devices revision

1. optical storage

   • examples
     • CD(compact Disc)
     • DVD(Digital Versatile Disc)
     • Blu-ray disc
   • advanteges
     • disadvantages
       • not cheap if terabytes needs to be stored
         • not as portable as flash memory
           • easily scratched
             • cannot write over stored data
     • cheap if less than 10GB needs to be per media item
       • very portable compared to HDD
         • immune to magnetic fields
           • store movies and videos
   • infomation
     • de[ending on what disc storage can be 700MB-50GB
     • slower than HDD but faster than tape
     • fairly portable
     • not very reliable
     • very cheap
     • needs protecting from extreme heat
     • data can be corruptedif scratched

2. magnetic storage

3. sold state storage

4. there are three types of storage devices optical, magnetic and solid state