One of the tweaks in Snow Leopard that I really like is the way my external drive, used only for Time Machine backups, stays suspended unless a Time Machine backup is in progress.
Previously under Leopard, my external drive would spin up randomly which I found very annoying.
I am now deaing with an annoying bug. Anytime I try to save a document, in Pages or Word or anything, the save dialog hangs for a a moment while my external drive wakes up. Once it is awake, I am able to chose a save destination.
Is it possible to prevent this behavior? I'd like to exclude my external drive as a place to save documents.