Seeing partitions on USB Drive in Finder

Hi
I have a PowerbookG4 (17", dual layer SD) with 1.5 GB RAM.
I bought 300 Gig Internal HDD and converted it to an external USB drive using a MadDog Combo Case.
Last evening, I partitioned the HDD into 6 partitions.
The issue is I see only 5 of these partitions in the left panel of the Finder window, while I see all the 6 partitions mounted on my desktop. The "missing" partition is named "My Music"

Select the My Music partition on the desktop and drag it into the sidebar on the left. Alternatively, you can choose Preferences from the Finder menu, click on Sidebar, and put a check mark in the box Hard disks.
(10834)

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