Disable all writting to disk

OK is it possible? Can someone tell me what can be written to disk while MT is working? Logs ok, anything else? What I really want is to set MT to treat my disk like it is Read Only. Right now I have MT 2.8. So Can it be done in 2.8. If not can it be done in 2.9?

Thanks!

P.s. Sorry if this question was already on forum