Can't mount WD external hard drive after upgrade to Mountain Lion

I have two external hard drives on my iMac.  One for Time Machine and Aperture Library Files (My Book Essentials formatted Mac OS Extended Journaled) - this works fine. 
The other is an older WD 500Gb drive which is partitioned Windows_Fat_32.  (Keep in mind, I'm not even sure what this means exactly).  It contained my iTunes library and a lot of photo backups.  It worked fine on my iMac with Snow Leopard, but since upgrading to Mountain Lion, it won't mount.  I get an error that says "this drive is not readable by this computer" and I get options to "intialize", "ignore", or "eject".  Disk Utility sees the drive but won't let me do anything with it.  Is there a way to salvage this data?  I don't mind reformatting after I move the data or getting a new drive, but I don't want to lose the data.  My iTunes music files are extensive and they are on the good external drive, but the "library" is on the bad one...
Sorry if I haven't explained well..

hi,
it is kind of late, but I wonder, did you manage to solve the issue?
I have lacie drives, and the firmware upgrade is apparently required, but I cannot find the appropriate one at lacie's website... the ones i tried do not recognize my drive...
my lacie quadra d2 250 GB (USB, FW 400, 800) goes to sleep, and does not wake up....
I'm still searching for help...
ps: lacie's support page is quite hard to pierce, they require one to sign up, but no support for latinaamerican countries... so I could not sign up, therefore could not reach their support

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