Is there a known USB 3 issue with Mountain Lion?

I have a 17-inch early 2008 MBP which only supports USB 2.0. My external hard drive, WD My Essentials 2TB has USB 3.0 connection but it worked fine with Lion. After upgrading to ML, it doesn't recognize the drive at all. Is there a firmware update coming which would allow older machines to operate USB 3 devices on ML?

Try both of these, the SMC reset is the most important:
SMC:
http://support.apple.com/kb/HT3964
PRAM:
i. Ensure the machine is powered off.
ii. Locate the following keys on your keyboard in preparation for Step 4:
‘command’ – ‘option’ – ‘P’ – ‘R’
iii. Press the ‘power on’ button.
iv. Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
v. Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up normally.

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