ELI5: Explain Like I'm 5

disk sectors

Disk sectors are like the pieces of pies in a pizza. A disk, like a pizza, is divided into different pieces. Each of these pieces is called a sector. When you want to store something on your computer, like a picture or a video, it is split up into tiny pieces and stored in different sectors on the disk. The disk knows where all the pieces are, so when you open the picture, it will be able to put all the pieces back together.