I have a Mac Pro with multiple internal drives where OSX, my apps and the admin user is on an SSD while my regular users are on a separate drive. Mac Performance guide's "relocate the Home directory off the boot drive" explains how and has been working fine for a long time. But recently I've been having various problems and made it worse by messing around with changing permissions/ownerships, so I've decided to backup and reinstall everything. So far the SSD is done, so next is the data drive. But after creating the additional (normal) users I tried to copy these over to the data drive (logged in as administrator) and got some error messages about permissions and/or ownerships, so now that I've backed up the whole drive my plan is to reformat the data drive, copy the user folders over to that drive, relocate the users ("Users & Groups" advanced settings in system preferences as described in the above Mac Performance guide), then copy over my files/folders one by one. My questions is: when formatting ("erasing" in Disk Utility) the data drive prior to copying the newly created user folders (from the SSD), should I be logged in as admin or as the main regular user or doesn't it matter? Obviously I need to be logged in as admin to copy over the other users and relocate them, but I want to ensure that the permissions will be correct when I erase the data drive to begin with.