not working on my dc+sector 300 error

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I HAVE READ ALMOST EVERY POST NOW TOOK ALL THE ADVICE BOUGHT A YAMMY 8X8X24 SCSI WRITER (THE NUTS)
BURNT 40 SUCSESSFULLY SO HERE IS MY PROBLEM
ON NBA TONIGHT I AM GETTING A WORKING COPY USING DJ
BUT IT JUST KEEPS COMING UP WITH THE SEGA LOGO REPEATEDLY
IT WORKS ON A FREINDS DC NO PROBLEMS.
SECOND PROBLEM TRING TO COPY LE MANS 24HR GETTING SECTOR 300 ERROR IS THIS JUST A CRAPPY COPY I AM TRYING TO COPY FROM.MANY THANKS

PS THANKS FOR ALL THE ADVICE
IGOTTASHIT666
BIG PAPPA
KEEP UP THE GOOD WORK