It isn't mandatory, but the Checked build of the OS adds a lot of asserts to
the kernel that catch errors in your driver that other tools do not. A wise
developer uses the checked build with driver verifier to do their initial
development and debug. In fact you should consider doing much of your
initial testing under Win2k3 since it has the best verfier, and since you
can use Call Usage Verifier on this OS. You do need to run the driver for
testing under the Free build also to test also, since you otherwise may have
timing problems you would not see.
--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
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