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First things first, I'm going to assume that you're running an Ext2, Ext3, ReiserFs or other such UNIX-compatible filesystem that supports the standard UNIX ownership, group, and permissions models. If you're using a FAT32 or NTFS filesystem on the 1TB hard disk, please discard my advice.
(NOTE: to determine what filesystem is on the disk, once it's mounted, type the "mount" command and check it's output for that mountpoint.)
Typically, when you want to grant more than one user access to files, you would create a new "group" that both users were a member.
However, you may already have a generic group that many (if not all) of your users are a part of. Sometimes this group is called "Staff", other times it's simply "users".
I would strongly suggest using the "id" command to find out if the "dean" and "mediatomb" users share a group.
Note that it is possible to have a group named after a user, so there very well may be both a "mediatomb" user, as well as a "mediatomb" group.
The fastest way to find out would be to check your /etc/group file.