Any drive can be bootable; it depends if the appropriate information is written to the boot sector when the drive is formatted. If you install OS X to the drive it should automatically make it bootable. Whether or not your Mac can boot off it is a different story, but it sounds like you're in luck...unless that note you quoted only applies to x86 boxes. -- Rich > -----Original Message----- > From: Eric Smith > > Thanks to both. By the way, the info on the controller says, > "Can be used as the boot controller when a bootable hard disk > drive is attached." How can you tell which drives are bootable?