External Iomega Drive Partition won't mount

Hi:
I have a partition on my Iomega external drive that won't mount. The drive has 2 partitions. One I use for back up works fine. This other one is visiable but won't mount. I have run disk utitility and it says everything is fine but says it isn't journaled. It won't let me turn on journaling and won't let me get it mounted, what can I do?

Hi Dennis:
Thank you for your attempt at helping me. I opened Disk Utility and saw the greyed out "video Editing" partition, clicked on it and tried to mount it. It says it cannot mount the volume. I then clicked on the greyed out drive partition and clicked on disk first aid. It gives me the following screen.
Verify and Repair volume “Video Editing”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
The volume Video Editing appears to be OK.
It just plain won't mount but I have in the past been able to see the contents inside and the other partition for which I use as back up for my iMac works just fine so I know the drive is working fine. I just cannot get this partition to mount.
Any other ideas?
Thank you,
Reid

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