There's no known "recovery" program built into the Mags, but I can't imagine ANY commands on another unit that would DELETE ALL TITLEs... theres' only one command like that in the HDD Menu, and I don't think you were in THAT menu to do a dub on another machine, were you?
I'd stop right now and let people think about this... there might be a "most-perfect" thing to do at this point but give people time to think what that might be!
Unfortunately, that does make sense. since going UP would go to the HDD Menu, as you said, and an OK would auto-select the first option there, "Delete All Titles."
OMG! Explainable but still a real FUBAR!
Just for information, heres all that we know about Maggy's title system:
Hard Disk File System investigation for the Magnavox 537, 535, 533, 515, 513, 2160A, 2160, 2080 &...
I don't know how I wandered back to 'delete all' on the menu I wasn't looking at - but EVERYTHING disappeared.
Of course I've almost refilled it again by now, but it still stings!