WD Passport External USB Drive - Really slow on Macbook I just got a Western Digital 2 TB "My Passport" USB drive and connected it to my macbook pro (it says it supports USB 3).  But when I tried to copy my photo library it said it would take 40 hours?

What could be going on?

Details: I'm on a Macbook pro 8,1.  With OSX 10.6.8.  I formatted the drive with Mac OS Extended Journaled.
That seems very slow. I have a MyPassport, which is a portable, self-powered drive. When I got it, I found the copies to be slow, but I found that WD has drivers for the drive that speed the copy up considerably. I'm not entirely comfortable having a third-party hard disk driver, but I haven't encountered any problems with it.