There seems to be a great deal of interest in watching DVDs on tablets/notebooks. My experience has been that getting 2-3 hours of time out of a notebook while watching a DVD is pretty good. However I regularly get 4-5 hours of normal use when not using a DVD. By ripping the DVD to my HD, I am able to get 3-3.5 hours, about an hours savings. This got me thinking, that at least part of what is eating my battery life is the constant spinning of the HD. By converting to DivX a two hour movie can be reduced in size to about 800M-1G. This is small enough to fit entirely in RAM with the OS loaded (I have 1.5G). So here is my question (I know you've been waiting ), is it worthwhile to set up a RAM disk of some sort to copy the file in there and then play it from the RAM disk. This way the HD could spin down. I'm not interested in going through this exercise to get another 10 minutes. If it will consistently push me over the 4 hour mark it may be worthwhile. I really don't want to invest a ton of time in this if the general consensus is that the savings will be negligible.