I have a Mac Pro 1,1 (2007) with the Apple RAID Card and 3 500GB drives in RAID 5. This leaves a total of about 1TB space, which [for historical reasons] is split into two 500GB partitions - one with the OS and home directories, the other with project data. I just received an additional 500GB drive matching the 3 already present, which I intend to add to the array -- bringing the total space available to 1.5 TB. Since I need to backup and restore the filesystem to expand the array, this is the perfect opportunity to revisit my partitioning scheme. The problem with the current scheme is that I often find myself in the situation where I am working on a project, and one partition is full, but the other has plenty of space - so I end up wasting a lot of time moving files from partition to partition to get things done. So no matter what, I know that I want to combine the home directories and project data on one large partition. The question is should I have: 1) A separate small partition for the OS and a large one for everything else? 2) One giant partition for everything? I can see advantages to each -- but what do you out there think? Spidey!!!