I have a 2011 27" iMac with the 256GB SSD and 2TB HDD. The Lion installer sees both drives, but the SSD is grayed out and tells me that the disk is not bootable. Of course, the SSD is my boot drive! For the record, I have added and removed partitions for the Lion Gold Master. I have also tried the trick of resizing the partition to get the bootloader to re-index the drives. Still, no success. According to Twitter, many others have this same problem and it's nothing new to SSDs on Macs. Does anybody know of a solution short of wiping out my SSD and trying a clean instal?