Question

Write a short note on : a) virtual memory b) PCB​

Answer 1

Answer:

here is ur answer buddy

Explanation:

a)Virtual memory: Virtual memory is a feature of an operating system that enables a computer to be able to compensate shortages of physical memory by transferring pages of data from random access memory to disk storage. ... This means that when RAM runs low, virtual memory can move data from it to a space called a paging file.

b)PCB: A process control block (PCB) is a data structure used by computer operating systems to store all the information about a process. It is also known as a process descriptor. When a process is created (initialized or installed), the operating system creates a corresponding process control block.

Answer 2

Explanation:

This extra memory is actually called virtual memory and it is a section of a hard disk that's set up to emulate the computer's RAM. The main visible advantage of this scheme is that programs can be larger than physical memory. ... First, it allows us to extend the use of physical memory by disk.

pcb

A printed circuit board mechanically supports and electrically connects electrical or electronic components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.