Since dust is an enemy of electronic equipment, this will help to extend the life of your computer. Well, you have to use a little imagination. Your hard drive is composed of very fast spinning disks, usually four or more, and read- write magnetic heads. Actually the care of the drive is in how the data is stored. First is leaving enough space on the drive so that the programs you run have room to move data around.
C lean the drive on a regular basis.
Not with a wash rag of course, but remove unnecessary files, such as windows temp files. To do this become familiar with your hard drive directory. When you install a program it will create a new folder for that program. I know my directory by heart, I know when something is added or deleted, and it helps. Sometimes when you delete a program using its own uninstall file it will leave remnants of itself on your drive, so that you will have to manually delete these folders and files left behind.