GCSE Computing - Memory

GCSE Computing - Memory

1. RAM

   • Random Access Memory
   • Memory addresses can be read or written too
   • Stores an electrical charge to represent a value of '1'
   • Has a volatile memory

2. ROM

   • Read Only Memory
   • Has non-volatile memory
   • Contents cannot be deleted
   • BIOS is a common chip for this type of memory

3. Virtual

   • A procedure which comes into effect when all the RAM has been used up
     • Data held in the RAM that has not been accessed recently is sent to be stored temporarily on a section of the hard drive.
       • This "extends" the RAM capacity
         • The read-write time is far slower than of the RAM, so it is accessed far slower

4. Cache

   • A store of data that allows future requests to be served quicker
   • It is very quick to read and write
   • Data that is chosen to be stored in a cache is often such that is frequently accessed

5. Flash

   • Type of non-volatile memory
     • Uses solid state technology
       • No moving parts
   • Makes it more reliable and durable than other altenatives