I'm using Air on 10.7.2, using a LaCie hdd connect via usb port. I experienced a really slow boot whenever the external drive plugged in. 1-2 mins in grey screen before the Apple and the spinning cycle appear. usually it boots in <20 seconds. If I unplug the drive, the boot process continues as usual(fast). I test my drive on my iMac and it boots just fine. I test with HFS+ Journal as well as exFAT, problem persists. I test with both of the USB ports on my Air, no change. My guess is the machine is trying to see if the external drive is bootable!? how do i prevent this action? Any help?