Can't see external HD partition on finder, changed Ownership & Permissions

Hi all, a friend has a particular issue with his external HD. He clicked one of the partitions on his external HD and started restricting the options under Ownership & Permissions, until he got ALL permissions set to "no access". Now the HD appears, but the partition he modified does not appear on his desktop or finder, also when he runs Disk Utility he sees both partitions, but the one he changed the permissions/access of, appears as a blank document icon, like when the OS doesn't know with what to open it with, therefore, he can't select it again and click get info/change access again. Any help, tips please? Thanks in advance mates.
MacBook Pro 15", 1.83 GHz, 1.5 GB, 80 GB iPod 5G 30GB White Mac OS X (10.4.6)

Use the instructions in this FAQ to restore access to that partition.
(12892)

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if anyone has an answer please email/IM me on [email protected]

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Can't see external HD partition on finder, changed Ownership & Permissions

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