If you're interested in changing a disk's mounting point in 10.4, here's how to do it. One might use this to move the /Users directory to some other drive, for example.
[robg adds: A little pre-hint warning; I haven't tested this one, and mucking about with a drive's mount point isn't something to be done lightly. If you're going to use this hint, please make sure you have a good backup, and know what you're doing. You'll also need to have root powers for most of the following steps...]
- Using Disk Utility, read the drive's Universal Unique Identifier (UUID). Click on the volume you wish to move, then click the Info button and find the Universal Unique Identifier line. You can select the text here and copy it to the clipboard, too. For this example, we'll assume the volume's UUID was 12345.
- Create new directory where you want to mount your drive. For example, sudo mkdir /foo.
- Edit your /etc/fstab file, and add a line with the UUID and mounting point information (don't forget to add appropriate r/w and file system information):
UUID=12345 /foo hfs rw 1 2 - Load the updated /etc/fstab file into NetInfo:
niload -d fstab / < /etc/fstab - Mount drive using Disk Utility. The drive should be mounted in your new directory -- /foo in this example.

