Not sure how accurate title is, but I need some help here, By friday would be best. I have an 80GB HDD, so I'm a little bit crammed for space. My biggest problem with space is operating systems. I use parallels to run a few OSs, 20GB worth are on the HDD. My problem is that sometimes I need to boot up in only one OS, using Boot Camp, and sometimes I just want to use parallels. Because I don't have a lot of space I can't just install them each twice, that would be half my HDD! I'm looking for a way to use the same OS to boot up in parallels or Boot Camp. Now from what I understand parallels allows you to boot up your OS located in other partitions to run next to Mac. Am I correct? Assuming I am correct, I have another problem. I am always needing different amounts of space, so setting a permeant space for each (partitioning) doesn't fly. (I know I can just make the Boot Camp partition large then use it for my Mac as well, but that just won't do either) When you boot the Boot Camp partition up in parallels how does HDD space work? So I need to be able to adjust the partitioned space without having to erase it. Is that possible? Is there any way to boot the computer into a different OS that is on the same partition as Leopard? One last question. Is there any way to boot the computer into a different OS by using an external drive? This would not make up for the other questions, but it would be helpful. Any input would be appreciated. Thanks!