Recently, I bought a GigaSave external harddrive enclosure. I love it and it works perfectly with my Powerbook. I use the external HD about 3 or 4 days per week. When I am not using it, and leave it on, it's almost like it's sleeping as there is no noise or heat (as a previous HD enclosure created a lot of heat). With the above info, do you think I can leave the HD turned on round the clock? The reason that I ask is that my main concern is preserving the on/off switch. Any thoughts?