As far as I know, 212GB is enough for Lion, since MacBook Airs are sold with a 64GB drive. The real question is more how much free space is available on the drive. Apparently OS X needs 15 to 20% of available disk space for swap files, etc. Maybe somebody else can elaborate... Alexandre Sent from my other mobile device On May 3, 2012, at 17:29, catsoul <catsoul at thinkplan.org> wrote: > I have a 2009 Mac Pro with 640GB Drive that came with it; this drive is partitioned into 3 equal partitions of 212GB each. > > So, is 212GB enough for Lion to be fully "happy" and to work its best, or would it be better with the drive cut in two, so, 320GB, or no partitions at all? > > Another idea suggested by a friend is that if you can install on a smaller partition that's closer in on the platter, performance can improve owing to less drive space to consider and shorter distances for the read/write arm if the OS is closer in rather than further out to the edge. > > Any thoughts on these questions and ideas? > > Thank you > > cat > _______________________________________________ > X4U mailing list > X4U at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/x4u