Every so often my 6TB hard drive disconnects, why? Then It just goes on with out having to reconnect it. I have over drives on there but it never happens to them ,they are M2 drives.I do have an IMAC with Windows on a M2 drive and some times it tells me to keep it plugged in, it is always plugged in. But i think that is just Windows because so times it says there is a problem with it and you have to go through all that stuff repairing it etc.