Reminds me of my friend not shutting down his NES for over two weeks because his copy of Zelda II had a faulty battery. Even with a working battery the save system kinda sucked.
It basically says "Really sorry. The record of your adventure disappeared." ... Then you get to a fresh home screen as if your save game never existed..
Ugh. I had repressed the memories of losing hours of game time in Dragon Warrior. Losing saves in that game almost made me quit playing games...almost.