dalmations

Hi, I would like to do a unattended install but am concerned that it may install on to the wrong hard drive. I use my 20 gig HD for my XP OS. It has always labled itself as 'F' Drive. The other a 80gig HD I use for storage, (family photos/film.software, music, saved files etc etc.) It has always labled itself as 'C' Drive. I do not know why they lable themselves this way, they just do! My concern is, if I put in the CD disk and it loads up, formats and puts a clean XP OS onto the storage drive, (C Drive) instead of the correct smaller drive, thus losing everything. (Before anyone says anything I always back up info - but thats not the point here. Q. 1 Would an unattended reload automatically go back onto the drive where the XP OS was? In this case the 'F' Drive (20 gig) Q. 2 How can I make sure that this does happen and not load onto the storage drive 'C' Drive (80 gig)? Sorry if this has been asked before. I have searched but could not find a clear answer. Regards dalmations