[ubuntu] 12.10 burned to dvd

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http://ubuntuforums.org – i downloaded the 12.10 32 bit ubuntu and burned it to dvd-r 8x at 4 speed, i did not do the checksum i just verified it with ImgBurn Do i need do this? When i boot, i am going to run it from Dvd not install it, so how do i do that? on a toshiba c655 laptop with win 7 dual core tks (Hardware)