Unable to mount Western Digital Hard Drive after upgrade to 10.6.4

I have tried to search for a solution to my problem, but have not found anything that seems to help. So hopefully someone here can provide some guideance.
I have a Western Digital 1TB My Book that I have been using primarily for backing up photos. The drive is formatted as FAT-32 so I can work with it from my Windows XP laptop too if I need to (although my Windows laptop mostly collects dust since getting the Macbook). I have been using the feature in Adobe Lightroom to automatically backup each photo to the My Book when it is being loaded into Lightroom. I also backup the Lightroom catalogs to the My Book.
Occassionaly I would get the "beach ball of death", but not always related to being in Lightroom at the time. I recently had a beach ball incident. After a restart and using Disk Utility on the Macbook's HD, I decided to check for any updates. At this time I ended up upgrading from 10.6.3 to 10.6.4. After doing the upgrade, I can see the drive in Disk Utility, but the "My Book" volume is greyed out. Running "Repair Disk" has no effect. The "Repair Disk Permissions" buttons are greyed out. I cannot get the My Book volume to mount to be able to use the drive. If I plug the drive into my Windows XP laptop, Windows can work with it just fine. I ran the windows check disk program, which took 24 hours on 1TB, and it did not find anything. Plug back into my Macbook, and it still cannot mount the My Book volume.
I also tried to plug in a Western Digital My Passport portable 400GB drive which is powered by the USB and does not require a separate power supply cord. It has the same issue where the "My Passport" volume cannot be mounted.
Does anyone have any ideas on how to get the Macbook to mount the drive again? NOTE: I'll probably not be able to try any suggestions or respond until Monday, but if there are multiple suggestions queued up over the weekend it will give me a good starting point when I can get back to this on Monday.
Thanks,
Jim

tempest68 wrote:
The Combo Update worked. But I need to know why.
Although I have no proof or authoritative source that confirms this, using the Combo seems to account for anything missed by or changed since earlier updates.
This originally started after check for updates, and the 10.6.4 update is when the problem started. What is different about the Combo Update, ...
Pragmatically, the difference is that it just works for me. Mathematically:
Combo http://support.apple.com/kb/DL1048 is File Size: 887.37 MB
Incremental http://support.apple.com/kb/DL1049 is File Size: 607.21 MB
887.37 - 607.21 = 280.16 MB more in the Combo.
... and how would I have known about it had someone else not directed me to it.
If you have skipped some updates, your Mac's Software Update... (SU) will suggest Combo.
Someone else (Thanks, Defcom! ) told me about Combos years ago while I was still running 10.3.x.
BTW, many users never use or seem to need the Combo.
You seem to be an experienced user. If you have been using Macs trouble-free for a long time without updating via the Combos, you may decide not to bother with the Combo except in specific cases where you have a problem that isn't corrected by other fixes.
Is there somewhere on the website I need to check regularly in addition to the normal updates?
You can search Support Downloads for the latest Combo Updates any time.
http://support.apple.com/downloads/
You can decide when to search any way you choose, but here is my process:
• I set my Macs' SU Preferences to Check for updates: "Daily."
• I do NOT enable "Download updates automatically."
• When SU notifies me that a Mac OS update is available, I quit SU without installing anything.
• Then I repair permissions, download and install the Combo, and repair permissions again.
• I then run SU again to install any other updates that are available on the same date.
Message was edited by: EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz w/Mac OS X (10.6.4) MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.4)
LED Cinema Display G4 PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

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