Maxtor DiamondMax 10 No Longer Recognized (10.7.3)

I finally upgraded my Rev A G5 PowerMac and purchased a new 27" i7 iMac - I was extatic! Everything went well the first day while I was setting it up. I had all my iPhoto and iTunes files on an internal SATA drive (Maxtor DiamondMax 10) on my PowerMac and put it in an external enclouse so I could just pick up where I left off. The iMac recognized it right away and I was back in business.
Then I decided to run Software Update and get all the latest updates. One of these was a combo package (I believe) that put me at the latest verion of Lion (10.7.3). After the restart my Maxtor drive was no longer mounting. I went into Disk Utility and it wasn't there either. Of course this rendered my iPhoto and iTunes usesless.
At first I thought the drive died and I was exteremly worried as all that stuff was in limbo until Time Machine could kick in on my iMac. I dragged out my old PowerMac, connected it back up in the tower and it worked like a champ.
So what happened? Is there some kind of problem with 10.7.3 and my drive? Maxtor (now Seagate) has no mention of a DiamondMax 10 on their web site so no drivers exist. I'm pretty bumbed.
Any help would be great!

In case someone suggests it, I just tried using a different USB cable and it still won't mount.
Does anyone know if it's possible to revert back to 10.7.2? That is what my iMac shipped with when the drive worked but I don't have a physical copy of Lion it seems. I read on the forums about logging into disk recovery and reinstalling that way, but I'm not sure if it would install 10.7.2 or 10.7.3 since that is the newest version.
Anyone know?

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