Unit 1.2 (Memory)

Unit 1.2 (Memory)

1. RAM & ROM

   • Two items that are stored in Random Access Memory (RAM) is data currently in use and commonly used instructions or programs
   • RAM is volatile and ROM (Read Only Memory) is non-volatile

2. POST

   • The role of the Power On Self-Test (POST) is that the BIOS chip checks components are present, and hardware, if it is fine, it will start the CPU
     • BIOS is an basic input/output systems that contains programs to load the hardware

3. Virtual Memory

   • Virtual Memory is implemented is by the Virtual Memory Manager (VMM), creating a file on the hard disk and the OS moves data
   • Virtual Memory is an area of secondary storage and used like RAM located in the hard drive
   • Disk Thrashing is when a computer's virtual memory subsystem is in a constant state of paging

4. Flash Memory

   • Advantages of Flash Memory is its portable, no moving parts and requires no power
     • Disadvantages of Flash Memory is its expensive and can be lost easily

5. Cache

   • Cache is a type of memory, is has a very small amount on the processor chip, but is very fast
   • Increasing the cache size will reduce the number of memory to disk transfers and may speed up processing of these instructions

6. Solid State

   • Solid state means that there no moving parts, so it doesn't make noises, however there can be noises from the connection.
   • Memory Stick