1.2.1 (3) - Virtual Memory + Flash Memory

What is Virtual Memory?

A way to compensate for a shortage of RAM.

(roughly) How does it work?

It allocates a portion of the HDD/SSD as extra memory, imitating RAM.

(in detail) How does it work?

• Data is divided pages, then assigned virtual addresses which refer to data that may be stored in RAM or Secondary Storage

• When the CPU needs data not in RAM, the OS loads the page into RAM from Secondary Storage

Why should Virtual Memory not be confused with Virtual Storage?

Virtual Storage referring to secondary storage located away from the computer

What is the downside for using SSDs for virtual memory?

Continuous use would reduce its lifespan.

What is Flash Memory?

A non-volatile memory chip that a microcontroller uses to store instructions, sometimes data.

Why can Flash Memory serve as both Main Memory and Storage in small devices?

• Normally only a single program, so not much need for much memory

• Space efficient