the Z: drive is what you see if you havent mounted a drive yet.
type
to mount your C: drive.
You can mount your C drive in DOSBox as anywhere on your physical drive(s).
e.g. I use:
If you dont want to have to type it everytime you start, enter it into your config file.
Hope it helps, Sean, although you could have found out yourself if you'd taken a look at the help file/FAQ/forum/typed 'intro'