Here's what I want to do. I have a 1.5 Tb external USB drive that I want to use with both my MacBook Pro and my soon-to-be Windows 7 desktop PC. I want to make image backups of both systems onto this external drive. For Windows, I'll use a boot CD with Acronis TruImage. For the Mac, I'll use SuperDuper! I've been playing around with partitioning this drive so that I can accomplish both of these goals and I'm a bit stumped. I was able to get a two partitions created - one for Windows (NTFS) and one for Mac (HFS+), and at first look they appear to work fine. However, there appear to be two problems: 1) When I look at the disk in Windows Disk Administrator, there are two smaller "hidden" partitions that I did not create. I think they were created with the Mac formatted its partition. 2) When I boot my Windows computer with the Acronis TruImage CD (and have the external drive plugged in to USB), the Acronis software doesn't see the external drive. When I boot into Windows, the drive is there and accessible. So, I can deal with problem #1 if those hidden partitions are necessary for the Mac. However, I really need to resolve problem #2. My initial guess is that it can't see the drive because when I partitioned the drive on the Mac, I did not choose "Master Boot Record", rather, I chose the one for Intel-based Macs. So...any ideas?