1.2 Memory

1.2 Memory

1. SSD (solid state drive)

   • Solid storage media with no moving parts or a device that uses flash memory.

2. RAM (Random access memory)

   • RAM is non volatile as it erases data when turned off and it holds data and information currently used by the CPU.

3. Cache

   • Cache is a hardware or software component that stores data to make the CPU execute instructions and data faster.

4. Flash Memory

   • A kind of memory that stores data without a use of power.

5. Virtual Memory

   • Virtual memory is simulated memory that is written to a file on a hard drive that appears to exist as RAM but is secondary storage

6. ROM (Read Only Memory)

   • ROM is volatile and is not erased. It is permanently on the ROM chip and holds the start up system and the bootstrap loader.

7. Registers

   • MAR (Memory address register) copies and transfers the data on the PC (program counter) through the address bus.
   • PC (Program counter) is where the next instruction is held in the processor.
   • MDR/MBR (Memory Data/Buffer Register) is where data and instructions are held to be executed.
   • CIR (Current Information Register) is where the information from the MDR is held after it has been executed.

8. POST (Power On Self-Test) BIOS Chip performs checks to make sure components are present in the system and when it is completed it boots up system but if it fails, it displays error message.