I feel kind of silly asking, but hey there is no such thing as a stupid question (only stupid people)? I got this bright idea... I only have 128gb of storage on my MBA. Which is should be enough for me. I have a tiny little flash drive (one of those the size of the ones that work w/a wireless mouse). I put my movies on the flash drive. My question is, if I was to just leave that flash drive plugged into my MBA all the time, would it reduce my battery life by much?