What affects the burn speed?

Hi there people, I am using a 12x10x32 burner and the software is nero 5.04.?. The machine is an old 486 with 32mb ram. I was wondering the burner doesn’t read or write anywhere near the speed it says. My ? is what affects the speed at which it reads and writes?. Does the HD speed affect it, bus speed I dunno I’m just a little clueless. Any one knowlegable on this?.

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