I got bad performance from VMware Fusion (tearing etc) so I made switch to Parallels Desktop 5. It's certainly better but I have a weird problem. My HD setup is 2 x SSD raid0 as a boot drive for OSX, a single SSD for Windows 7, a 1TB drive for files and another 1TB drive for Time Machine. That's a total of five HDs - so one of the SSDs is in the optical drive bay. I got Parallels installed ok, but if I boot OSX and restart Parallels I get the following message: (the disk name varies) The Boot Camp partition /dev/disk1s2 used by Hard Disk 1 is not supported. Please open the virtual machine configuration and select a supported Boot Camp partition in the Hard Disk 1 setting. When I go to Virtual Machine / Configuration / Hardware / Hard Disk 1 I only see two HD's. Also their number varies from time to time. If I choose the other disk that's visible Parallels starts fine. If I log out of Windows and restart Parallels it works fine. But again, if I reboot OSX then the same things happens again. The help files says: Note: You can connect up to four IDE devices (hard disks or CD/DVD drives) and 15 SCSI devices to a virtual machine. Each device is listed separately in the Virtual Machine Configuration dialog and has its own number. Does the limit of four IDE HDs also mean the SATA drives? Anyway... I took the two 1TB drives away to drop to the four drives. If one of the SSDs is in the optical bay I get the error _sometimes_. If all the three SDD are on the HD bays then it works fine. Weird. Anybody have an idea what's the problem is and how I'll solve it? If necessary I can live without the two 1TB drives working in Windows, but of course I'll need them in OSX.