I just purchased Logic 5 (and the same day got my Logic 6 Upgrade order into magic USA) and all the Emagic synths, although I won't be installing anything until I receive Logic 6. I'm getting ready to reformat my two 80GIG HDs on my Dual GIG G4 and reinstalling the largest version of OSX. I was wondering if there is a performance difference of putting OSX and Logic 6 (and ES2, EXS24, EVB6, etc...) on the Master drive or the Slave drive. Same questions for disk streaming for the EXS24; Is there is a perfomace difference of putting all my samples (including the The Vienna Symphonic Library Orchestral Cube and the Performance Set when it's released for EXS) on the Master drive or the Slave drive. Thanks Mike