[ubuntu] Issue changing permissions on external hard drive Ubuntu 12.04

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http://ubuntuforums.org – Hello, I'm trying to use an external hard drive (formatted from my installation of ubuntu 12.04) to backup a macbook pro. I tried using it with the macbook but found I can only read from the drive when it is mounted there.. When mounted in ubuntu, I do the "ls -l" command and I get: drwx------ 1 crang crang 4096 Aug 3 23:02 hard_drive_name (crang being my username, I own the thing!!) As you can see, I can read, write and execute from this one computer, but as far as I understand I can't do anything on another computer.. so I've been trying to change the permissions on the drive (Hardware)