Optimal WDIDLE3 Setting For WD20EARS Hard Drives

Ok well I used “Ultimate boot cd” to import “Wdidle3” into it, and created an iso so I can boot “Wdidle3” to work on a blank cdr. I’m ready to use it on my WD20EARS hdd, but have been advised not to do so by people on other forums saying it’s not intended for use on my hdd model. What should I do? The hdd will be used as an extra data drive so it will be sitting in a USB enclosure for long periods of time, if not 25 or so days without moving it. So far I gather 5 min idle time is ok? Check it out: http://www.geekstogo.com/forum/topic/285453-whats-the-optimal-time-in-seconds-for-hard-drives-to-park-heads/