1.2 Memory Flashcards
What does ROM do?
Holds the 1st instructions for the computer to boot up (BIOS).
You can only read this.
What does RAM do?
Holds the instructions of the data, OS and applications currently in use.
You can read and write (edit) the RAM.
What is the difference between opcode and operand.
Opcode stores instructions.
OperanD stores Data.
Why is RAM volatile?
Everything stored in it is deleted when not connected to a power supply.
Which is bigger: RAM or ROM?
RAM.
Why is RAM faster than a hard drive?
It uses solid state chips.
What happens if the BIOS is written over?
The motherboard won’t work and instructions are lost.
What is virtual memory?
An area on the hard drive that OS transfers the data that is being least used with the currently used data when the RAM is full.
How do you overcome the creation of virtual memory?
Add more RAM.
What is disk thrashing?
When data is frequently swapped between the RAM and virtual memory, causing the programs to slow.
Why don’t applications run on the hard disk?
It’s too slow so data is transferred to the RAM which is faster.
What is flash memory?
Non-volatile drive which can read and write.
E.g. solid-state drive, USB, SD cards.
Why is flash memory more expensive than a hard disk?
Because it’s more portable, durable and reliable due to non-moving parts (less susceptible to damage).
