DSC is a newer version of ASC traction control. Basically ASC only brakes the rear wheels during straight line acceleration to keep the wheels from spinning and losing traction. DSC combines those features with additional ability to individual brake each of the 4 wheels is slippage (oversteer/understeer) is sensed in a corner to bring you back in line. There are a couple of demo Flash programs on bmwusa.com. I posted the links below, but if they don't work, go to bmwusa.com, highlight 3 at the top, then 3 technology.
If you like to drive your car hard, be glad it does not have DSC. This way you have the safety of ASC without the intrusive nanny-ism of DSC. DSC likes to cut in and put and end to your fun just as you're starting to have some. So then you turn it off and are left without even the equivalent of ASC. It's totally a lawyer-inspired driving nanny. You really are better off without it.
Of course, BMW marketing materials make it out to be the greatest safety feature since ABS.
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