I'm pretty sure that depends on your web host.
The drive letter that your space resides within is different with different hosts.
I use a program called dbadmin to make changes to my access database online. I had to start using this program when the database got too large for me download to make changes to it. Anyway this program tells me the path of my database including the drive letter.
Mine is something like E:\home\mysite\etc
Anyway if you're having trouble working out your database path on the server, download this app from:
www.stpworks.com
and it'll tell you....
There's probably a heaps easier way of working this out but this is how I did it.... hope it helps!