Will installing Lion affect 10.6.8 on another disk or partition?
Will installing 10.7 and above affect 10.6.8 on another disk or partition?
Will booting to a disk with Lion or above bother disks that are used when the computer is booted into 10.6.8?
Mac Pro, Mac OS X (10.6.8), 2.8 GHz Quad-Core Intel Xeon