I had one USB disk on Port1 (Seagate 250GB), with users, groups and shares all working the way I wanted. I had: Users: >admin >guest >john brown (for myself) Groups: >administrators >>admin >>john brown >everyone >>guest >>admin >>john brown Shares: >ADMIN 1 >>administrators (RW) >DISK 1 >>administrators (RW) >>everyone (R) After attempting to add a second disk (Seagate 750GB), I've had flakiness with users, groups and shares. Even after disconnecting the second hard drive, I still get the bad behavior. Under Administration/Users, 'john brown' is no longer a member of 'administrators'. When I try to add the 'john brown' back to 'administrators', I get "Error: Fail to add the user to groups." However, if I now go to Administration/Groups, select 'administrators' and click Members, it indicates that 'john brown' is a member of 'administrators'. Under Administration/Users, 'guest' is a member of 'everyone', and 'admin' is a member of 'everyone' and 'administrators. Back in Administration/Groups, select 'everyone', click Members, there are no members listed. If I try to add 'guest' to the 'everyone' group there appears to be no change. Under Administration/Shares, 'DISK 1', click Access used to generate, "Error: Fail to get group information for the share," until I added a share called 'junk'. Now I can see the group info for 'DISK 1', but 'junk' gives me the error when I click the Access button. After I acknowledge the error dialog, the Access Rights window lists no Groups with Access, and no Other Groups either. If I try to delete the 'junk' share, I get, "Error: Fail to delete the share." In the Home pages of the admin web utility, "User Log In (Private Data) is hyperlinked, but "USB Port 1(Public Data) is not. I thought users groups and shares were kept in the NSLU2 itself, but I bought a new one, and when I hooked it up, I got exactly the same users, groups and shares. Same behavior, but faster since it's not underclocked like my old one. Please advise.