I was wondering if anyone else has had this problem... I have an external harddrive - oem 2.5" 80gig in a nexstar3 case - running off usb power only. I've never had a problem with this setup on my macbook - using only usb power. However, when using it on my macbook pro the drive freezes and refuses to show up some times. It looks like it has something to do with how much power comes out of the usb ports - but why would the macbook pro have less... Anyone else ever have this problem - or problems using an external usb powered drive? Is it just my macbook pro? There are also no other drives plugged in at the same time. I also use the drive where there is no other power available..