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While looking for a Windows XP download in the MSDN subscriber portal, I noticed this:

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So, what is the Debug/Checked version?

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up vote 18 down vote accepted

The debug/checked version is used for debugging device drivers. It contains run-time checks for error conditions and has run-time optimizations removed.

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Incase it isn't clear enough: This means that the debug/checked versions will run slower than the ones designed for consumer use. – Hengjie Nov 5 '12 at 2:40

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