I've been recording to an external hard drive for some time. No problems! Then I removed the disk, and connected another disk to the TV (40PEL 6636T). It worked as well. But when I removed the other one, and tried to reconnect the first disk, I was told to format the disk, "and the content on the disk would disappear". The manual says I can't use the disk to record or play on any other TV, but it does not say that I cannot alternately use two disks. Anyone who have an good advice for what to do? I have a lot of stuff I want to watch on the first one.