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to perform a disc swap you will need an official PlayStation Disc
put your official disc in, and switch on the console
now after a few seconds the disc should start spinning at around double its
normal speed
as soon as it slows down after this, switch it over with your backup
and then that should accelerate to its full speed straight away
now when that one slows down, swap them all back
now the playstation logo on screen will disappear, at that point you must switch
them back over IMMEDIATELY
your backup disc should now be loading and completely playable
as you can see with mine there