where to load a large AU library (like Synthogy Ivory)?

[dpalitang22]

could this be too bonehead of a question to answer?

I tried to load Synthogy Ivory into my IMac, but it wouldn't let me load the AU to my external drive. Instead I had to load them onto my hard drive, taking up always valuable space (11-45 gigs, depending on how many pianos you load). Is there another way around this? My iMac says I can't load the AU to my external drive because it is a network drive. Would it help to designate the virtual instrument as a standalone rather than AU? Please help, thanks.