Paper 1 Revision

Paper 1 Revision

1. Memory

   • RAM
     • stores data that the computer is currently using
   • ROM
     • stores data used to boot up the computer
   • Virtual Memory
     • used when RAM is full

2. common security methods

   • anti-malware software
     • stops files/data from being corrupted
   • Firewall
     • controls who can send/recieve data packets
   • strong passwords
     • protects from unauthorised users

3. secondary storage

   • stores data permantantly
     • store programs (apps) and files permanantly
   • three types
     • Solid state
     • Optical
     • magenetic

4. compression

   • makes files smaller in order to save storage space
   • makes files quicker to send
   • lossy
     • removes data which cannot be restored
   • lossless
     • uses algorithms and can be restored