Phil, I think the book answer is probably a very helpful "it depends"! If you are not doing anything at the time and you have no reason to think the unit is still doing some data transfer from say a backup or edit, then probably nothing will happen. However, if the unit is still working on an operation of this kind, you may well lose data. If in doubt, you are best to shut down and this ensures that all data transfers are complete before the shut down is finished. 9 times out of 10 you'd be OK but it's the other 1 time that you need to worry about!! (Smile) Regards, Jamie _____ From: ptr1-users-bounce@xxxxxxxxxxxxx [mailto:ptr1-users-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Parr Sent: 13 June 2009 13:24 To: ptr1-users@xxxxxxxxxxxxx Subject: Wondering. I have a couple of those old p t r ones and I love them. So, what happens if you change media, the card, while they are powered up?. Phil Parr.