Free space bitmap

Imagine you have a big toy box where you can store all your toys. But every time you put a toy in the box, you want to mark the spot where it goes so you know where to find it next time you want to play with it. You can do this by drawing a picture of each toy on the lid of the toy box, so you remember where each toy is.

A free space bitmap works in a similar way. It's like a map that keeps track of the empty spaces on your computer's hard drive, so that you can find and use those empty spaces when you need to store new files or programs.

Just like drawing a picture of each toy on the lid of your toy box, the free space bitmap keeps track of each empty space on your computer's hard drive by assigning it a number or a code. Each code represents a specific area of empty space on the hard drive that can be used to store something new.

So whenever you need to save a new file or program on your computer, the free space bitmap tells you the exact location of an empty space on the hard drive that you can use to store your new file or program. It’s like having a map of your computer's hard drive that helps you find the right spot to put your new files, just like a map helps you find the right spot to put your toys in your toy box.