>> I wish to mount my windows partition to /mnt/windows such that only users of the group 'windows' can access (or at least, write) to it. <<
I hope to be corrected if there's a better way.
I have a server directory that's shared using SAMBA for the Windows boxes and NFS for the Linux boxes.
In order to get some consistency between the workstation platforms, I set the directory permissions this way:
owner = root group = staff permissions = rwxrwS = 2770
That gives full control (rwx) to root and the group staff. Then the Set GID bit forces all _new_ files to be group staff and owned by the file creator.
After a little experimenting in /etc/samba/smb.conf, I got the windows users to act the same way.
I don't know what you can do when stating with a fat32 partition. I trust others know those limitations.
Cliff Kent