Recording on panasonicdvd recorder dmr-ez17

I am recording dvd disks from one recorder to my new panasonic recorder. I have several disks that I wish to condense on a new disk. If the new disk holds 4 hours, will I be given an indication when the recording disk is full, so that I will know when to insert another disk onto which to record ?? O will it just stop recording while the other dvd player is still playing ??