Search Mac help for "setting permissions" and that should get you a good explanation of what owner, group, and others means. I also have an external hard drive connected to my computer. Some time ago I set permissions so that other users (wife, grandkids) on my computer have no access to the external drive. When they log on, the external drive does not show up for them. When I switch to my account, the drive is there. Here are my settings for the drive: Owner: john Access: Read & Write Group: john Access: Read & Write Others: No Access Ignore ownership on this volume is not checked. It's been some time since I did this and can't recall all the details but I think I was logged in as an administrator/root user when I changed the permissions. I had just gotten the drive and didn't have to worry about hosing any data on the new drive while I was playing around with changing permissions. John On Jul 8, 2005, at 12:10 PM, Tony Johansen wrote: > I was reluctant to take that step until I understand that this will > be OK, > and what 'group' means, and 'others' means in this context. > Experience has > taught me to go slowly when I'm not sure, I would appreciate your > further > advice. > > It seems the key is here, but Mac Help reveals little. >