I tend to keep some of my flash drives connected, simply because it is a convenient way to keep track of them. However a thought just crossed my mind, that since I have noticed that sometimes the activity light on my external SATA drives flash when they are not in use, perhaps that is because my AV is scanning them, but it happens too often for that to be the only reason. I haven't seen the activity lights on the flash drives act that way, but it still makes me wonder if there is some kind of activity going on unnoticed? I'm thinking about the limited lifetime of those drives and how it might shorten their usefulness. Am I being overly worried, or is it a valid concern?