Hi, I'm beginning to think my purchase of a shiny new iMac 27 was a big mistake - any knowledgeable advice welcome: Firstly, It's quickly becoming apparent that much of my essential software will not work in Mavericks (logic 8, FCP6 - which many of my clients still use so I need FCP6 for compatibility with their jobs). No problem I thought, I'll just create a partition and install Snow Leopard or Lion and use that when needed. It worked on my 2011 MBP (but the other way around: it already had SL installed, I just created a partition and installed Mavericks - works like a charm). But installing an older OS X on a Mavericks system doesn't seem to be so easy. I guess I just need to know if i'm wasting my time trying to get this to work or has Apple truly shafted me? As you can see from the attached pic. I managed to successfully partition the HD (approx 650GB Mavericks, 300+GB empty partition ready for snow leopard) Disk Utility shows the partition and it's mounted on the Desktop, but it doesn't appear in Startup Disk or when i reboot and hold down 'ALT'. Is there something very basic i'm missing here?