Computing - OCR - GCSE - Random Access Memory and Read-Only Memory

Computing - OCR - GCSE - Random Access Memory and Read-Only Memory

1. RAM

   • What is stored in RAM?
     • Data in current use
     • Operating System
   • Used in computer systems as the main memory.
   • Volatile Memory
     • Lost when power is lost.
   • Used to do immediate tasks.
     • Quick read/write times
   • More RAM - More programs open at the same time
   • Virtual memory
     • When all RAM has been used up, it moves data that has not been accessed recently (Left open in the background for some time) to the hard drive
       • Hard drive has slower read/write times but extends RAM capacity
   • Cache memory
     • Very frequently used data, quicker read/write times than RAM

2. ROM

   • Contains prerecorded data. Can only be read, not altered.
   • Non-volatile Memory
     • Not lost when power is lost.
   • Stores essential programs (Like ones that allow computer to start up)
   • Sometimes used in calculators
   • Flash memory
     • Non-volatile Memory
     • Solid State technology - no moving mechanical parts
       • Reliable and durable
       • Being developed to contain more and more data
       • Quicker read/write times than hard drives