read hard drive

I know how to read the drive with dir but how does it know the difference between free space and used space dir reads both because after running dir it tells me the amount of used space and free space number of directories and files,
how does it tell the difference between all these items.


thanks all for the help.

i would think it uses the F.A.T.

Try going through dos.h of your compiler. It has functions to determine between free space, used space etc.

Cheers.