what is the different between windows Checked and normal + symbol

[dedificator]

Differences between 'checked' and 'normal' versions are not only debug output and some error checking.
Checked version is built without code optimizations. There are many additional error conditions checking, such as variables type compatiblity and size testing.
Because of this checked build runs much slower than normal version.
I'm using it only for debugging (dual boot configuration). In general, checked version is very useful for kernel mode device drivers and system services testing.

P.S. Symbol sets for checked and normal versions are different too