Blu-ray discs cracked from Netflix...

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Originally Posted by Captain Morgan

But with the speed the discs spin in the player, it could potentially be a problem as the discs can possibly split and screw up the player.

It's possible. Mythbusters blew some up, but they had to spin them on a fucking router motor to do it. Even compromised, they're hard to explode.

What can also happen, is that the crack will cause the disc to wobble, and not focus up right.

It's clearly not ideal, but if the crack is small, and it doesn't reach the data, I'd probably try to play it if it was a rental.