Just sharing some information that may save you a bunch of trouble with Giga. Alex at TASCAM told me today that TASCAM does not support RAID configurations and suggests any solution involving RAID use with Giga should be researched on the web forums through Giga users who use RAID. He recommended separating the drives to avoid instrument loading and Gsp malfunctions.
I hope this helps others avoid these problems. I'll be trying that this weekend, when I have time to reload libraries.