Ok, so I've had this new Momentus XT Hybrid (500GB) for a couple of weeks in my Unibody Macbook. Initially, my boot times went from about 41 secs to less than 20. But then recently I noticed the boot times were once again as slow as snail snot. I was depressed because it seemed as if the SSD part of my NEW hybrid drive wasn't working any more. But I went to the Seagate forums and found someone had suggested that you check that the disk is actually selected in the "Startup" preferences. Ah ha! Mine was not selected. I am guessing that when I recently booted from an external HD for some testing (using the Option Key on power up) that somehow caused the "default" boot drive to get deselected in Startup Preferences. So, once I re-cheked that in the System Preferences, viola! The boot times are back to being lightening fast. Just thought I'd post this in case anyone else with a new XT drive finds their boot times slow following a boot from an external drive.