Both USB ports have gotten extremely slow

I was hoping someone could help me with a strange problem that has come up lately.  I have two external hard drives that I frequently move files around and have had no problems with speed rates via the USB ports before.  I have a slightly older MacBook version 4,1 according to the System Profiler and two fairly new external hard drives, both 2TB WD Elements.  I have been using these for over a year with no problem moving files around, crisp, not entirely fast but not incredibly slow either.  I am updated all the way on my Macbook to 10.6.8 and I have searched Google high and low for an answer but I can't seem to find out a solution.  The problem is that now where it used to take 3-5 minutes to copy over 1GB worth of files it now takes close to an hour.  I have tried other USB flash drives, other external hard drives and all of them are this slow.  I tried moving the same files, using a different computer, a MacBook Pro that is also 10.6.8 and the transfers are fine, same as they always were.  I have tried resetting the SMC but that did not fix the problem.  There seems to be very few other suggestions so I was hoping someone had an idea.
Thanks in advance for your help.

I also wanted to mention that both drives are formatted with GUID tables, one is formated as Mac OS Extended and the other is Mac OS Extended (Journaled).  Both are slow when copying to each other or from the desktop to the external hard drive.  Though the Journaled one seems faster when it is the only one plugged in.  The vanilla Extended seems to be slow regardless of whether it is plugged in by itself on either USB port.  Like I said above, this is not usual behavior, I have had no problems before a few days ago with USB speed.

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