Not sure if is me, but I have noticed that external drives aren't as 'reliable' when plugged in. I know they're meant for portability but you'd think having it plugged in long term would be ok. I find now and then drives need to be pulled out of USB (cannot safely remove etc) or drive won't show up. Pain. My experience, unfortunately, shows me to go internal if you aren't moving it much (don't go external instead of internal because of price if you're going to treat it as internal)... if that makes sense.