1.2 Memory Flashcards
What is the difference between ROM and RAM
RAM is volatile and can be written to and from
ROM is non-volatile and is read-only
RAM is larger than ROM
Is RAM faster than a hard drive? Why?
Yes
It uses solid state chips.
Is RAM volatile? Why?
Everything stored in it is deleted when not connected to a power supply.
What is the difference between opcode and operand.
Opcode stores instructions.
Operand stores Data.
What does RAM do?
Random Access Memory
RAM holds (temporarily stores) the instructions of the data, OS and applications that are currently in use.
You can read and write the RAM.
What does ROM do?
Read Only Memory
ROM stores the 1st instructions for the computer to boot up (BIOS).
You can only read this, you cannot write.
What happens if the BIOS is written over?
The computer cannot startup and instructions are lost.
What is VM?
Virtual Memory
VM is 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.
What is an alternative to Virtual Memory (VM)?
Increasing RAM (Random Access Memory)
What is disk thrashing?
When data is frequently swapped between the RAM and virtual memory, programs and instructions will take longer.
Which is faster a Hard Drive or RAM?
RAM (Random Access Memory) is faster, this is why applications are run on RAM not on the Hard Drive.
What is Flash Memory?
Flash Memory is a 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).
What do you need to look for when using a storage device?
HINT (there are 6)
Capacity
Speed
Portability
Durability
Reliability
Cost
