HDD Defragmentation - How it works and Why it works!

Many of us have come across the term "De Fragment your Hard for increased speed" or  "you have to De Frag your drive to keep it fast" and even "A full drive makes your computer slower" (a fuller drive worsens fragmentation)

SO WHY DOES IT WORK? - Think about Tetris!... sorta

Our hard drives are Spacious big entities where we dump our Operating system, data, pictures videos and other personal files, each file has a certain size, data is written onto the hard drive in blocks of information, small files take 1 or few blocks, while big and larger file take much many blocks, Have you ever played TETRIS? well, your computer plays Tetris too every time it saves files!

 

Each color represents a file, new big files will be split inside 

those empty spaces! Fragmentation in a nutshell!