USB Drive not available after 10.5.2 - URGENT (cannot access work files)

Just got the Software update for 10.5.2, everything seems to work fine, except that my system no longer recognizes my USB Western Digital My Book 500GB drive. The drive does not mount automatically as it did before. When I go into Disk Utility, I can see the drive, but when I click on 'mount' it says that this drive cannot be mounted.
The drive is still good, as I can read it from all of the other machines I have, it also is accessible from MSFT Windows on the Mac (via VMware Fusion). The Drive is formatted for Windows and worked fine before.
Please help, I keep most of my files on that drive and if it does not work soon, I will have to revert full-time back to my Dell so that I can work.
Why was this upgrade not fully tested? Is this par for the course with Mac OS upgrades...obviously this is my first Mac, and I was pretty pleased, but I have never lost a hard drive EVERY during a Windows upgrade...this is unacceptable.

Welcome to Apple Discussions neighbor!
You may need to remove a file from:
Macintosh HD -> Library -> Launch Daemons
called "com.WD.WDDriveServices.plist"
If that does not work, and the solutions offered here do not work, see my data recovery solutions on this FAQ*:
http://www.macmaps.com/backup.html
And never let there be only one copy of your data when upgrading again. You never know when a hard drive might fail.
- * Links to my pages may give me compensation.
Message was edited by: a brody

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