I've upgraded my mid-2009 MBP 17 with two 1Tb Western Digital 9.5mm drives (one mounted in the DVD bay using an Optibay adapter). The drive in the main bay is the boot drive, and both drives work perfectly. However, Disk Utility won't open - it just hangs with the spinning beach ball. I've even tried leaving it open overnight but the beach ball remains. Lion 10.7.2, fully up-to-date with software updates. Any ideas?