This morning I rebooted my MacBook Pro. It started trying to load a firmware update, which of course didn't exist because there wasn't one to begin with. So it hanged and sat there at 0% for about five minutes until I restarted it. Then, it booted to the spinning indicator. Then I restarted it again, the Apple logo, then nothing. I went into the Disk Utility app in the recovery, Macintosh HD was gray and it wouldn't mount until I erased the partition. It wouldn't let me repair or verify permissions. I then proceeded to reinstall OS X. The download took two hours, 20 minutes to install. A nightmare. Has anyone had this happen in Lion particularly?