Frezzing PS2 DvD back ups

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I had problems with Spiderman and Stuntman

Spiderman locks up on loading and Stuntman used to lock up after loading the main game but when it tries to runs the video footage it locks.

I reburnt Stuntman at x1 speed that appears to have worked ok after that.

But Spidy is still being a pain in the backside even after burning at x1 speed. It got further but locks up on loading.

For your reference I am using Memorex DVD's.