Question

how was sebastian shult's memory stored on michael's disk?did michael discover that?

Answer 1

Sebastian shultz met with an accident when he was playing a psycho drive game at that time his memory was stored
Yes he discovered

Answer 2

at the time of accident sebastian was playing psycho driven game on his laptop.when he banged his head in the accident,he got plugged into the computer .The computer  had saved his memory in its own.No michael didn't discover it.