External FireWire Drive Stops Mounting

Friends,
I did quite a bit of searching on this, and didn't find any answers. I have a 160 GB external FireWire that suddenly won't mount on my eMac, running the latest OS X. I store all my music and all my photos and videos on the drive. I can see it in Disk Utility still, but can't Repair or Verify (those buttons are grayed out). I can also see it in the System Profiler. The only thing I can't do, is mount it, or read it from my eMac.
Any suggestions?
Many thanks in advance,
Greg

Hello Andy,
Thank you for your help.
1. The drive just stopped working one day. I didn't do any upgrades, it just stopped working.
2. I don't remember the brand of the drive, or the enclosure. I could probaby find it in my records, but I bought them separate. From what I understand, the enclosure does have an Oxford chipset.
3. I have never updated the drivers/firmware. I saw there is an Oxford 922 update on VersionTracker.com, but I am not sure if I should try it. Should I?
One more development. I bought DiskWarrior in hopes of using it on the drive, but it doesn't see the FireWire hard drive at all. According to their text support, the partition is not showing, which is why the DiskWarrior can't see it. Does that many a difference in what I am dealing with here?
Thanks again,
Greg

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