>>... Are there any authoritative estimates of how large I should >>make [a] Snow Leopard partition? .... Ron Steinke replied: >You haven't said how large your drive is. How can we give you an >answer without sufficient information? The information is quite sufficient. What difference would it make if my drive were 250 GB or 2 TB? Nothing in the size of the drive has anything to do with determining the smallest disk partition that can comfortably accommodate Mac OS X 10.6.x. >My installation procedure was to divide my internal drive into two >partitions of equal size. You might want to consider the same >especially if you want to continue to use programs that Lion won't >allow to run. Trust me, I won't bother the list if the problem I'm facing is nothing more than how to divide by two. :-) Again, I'm looking for the smallest partition from which Snow Leopard can run without problems; nothing more. This is not a partition whose contents will grow over time, so even allowing for significant expansion is unnecessary. Onward, john