I've installed Win7 to D: on a machine that already had XP on C:. I was sSurprised to find that when the machine rebooted to Win7, the Win7 partition was now C: and XP was reassigned to D: That's not the case when setting up two XP partitions on one machine--the 2nd will boot from, and stay on, drive D: Initially I didn't like the partition shift, but I realized that there are places where I need that to happen. Does anyone know if Win7 always does the partition shift, or was that the result of the way it was installed? Any way to force that to happen? Also, do the two bootable partitions just exchange drive letters (bootable E->C, D->D, C->E), or are they going to sort of rotate? (bootable E->C, C->D, D->E) I ask because one system has XP on C:, with immovable data on D:. I'd like to install Win7, but need to make sure the D: partition doesn't shift. If I install Win7 to E:, if the above holds, I presume that it will 'rotate' the D: drive to E: (as above). I'd like to keep D: stationary.