SP1 and disk transfer speeds

I take quite a few photos with a 9 mega pixel camera. Since I installed
Vista, it has taken an extremely long time to transfer images from my
1GB CF card to my computer, even though I use and internal usb2 reader.
I upgraded to SP1 a few days ago, tonight was the first chance I had to
transfer files since the upgrade to SP1. I transfered about 70MB worth
of photos from the CF card to my hard drive in less than three seconds!
In the past this transfer would have taken a good minute or more. I
should add that I've been using Vista on the same system with no
hardware changes.

Eric