Do not know how it happened but have a Mac Mini late 2009 Snow Leopard, one user only. 2 Partitions, one for OS etc., one for My Documents. The 2nd partition now has a lock on the desktop icon. Permissions say custom. Can unlock in get info window but can not change from custom. Can not open 2nd partition. Should I try PermissionsReset.app or ? Thanks in advance for suggestions!