I can think of a VERY good reason to keep them separate! When OS 9 and earlier crash, they can, and often enough do, make a mess of the disk the OS resides on. This corruption is not always immediately obvious. Later, on, when you discover handfuls of cross-linked files... In olden times (pre-X), I always set up our company Macs with separate partitions for the System/Applications and for Data. This way, when the worst occurred, none of our work would be lost. If you are to be a regular user of OS 9, this confers a second benefit. It allows you to have separate System Folders for OS 9 and Classic mode. You typically need a lot more stuff (drivers and third party extensions) running the classic systems than you need in Classic mode, and this allows a super lean Classic mode System Folder. -- Robert MacLeay On May 21, 2006 22:43:43 -0400, Steve Adams wrote: >There is NO need to partition the hard drive. I've run every OS X >from X.1 to X.4.46 with OS 9 on the same partition, on the same drive. > >It might make things messier by having both OSs on the same drive and >partition (it's not that messy if you organize good) but there is no >reason to separate them.