Linked by Thom Holwerda on Thu 8th Jan 2009 07:16 UTC
Windows Even though the Windows 7 beta had been available on piracy networks for a while now, it still hadn't been officially released. During his pre-show keynote at CES, Steve Ballmer officially launched the Windows 7 beta onto the world via TechNet, MSDN, and Connect. It will become available to the general public this Friday.
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RE: Comment by MrEs
by xushi on Thu 8th Jan 2009 12:44 UTC in reply to "Comment by MrEs"
xushi
Member since:
2005-08-29

Little googling helps. I think this might be the answer,

http://msdn.microsoft.com/en-us/library/ms792432.aspx

Checked components of the operating system contain fewer optimizations and more debugging checks than otherwise identical free components. Therefore, checked components run substantially slower than free counterparts.

It is important for driver writers to remember that this slower execution can cause changes in the timing relationships among code paths. Therefore, the checked build can hide timing problems (such as race conditions or deadlocks) that might be revealed in the free build. Thus, you must test all of your drivers on both the free build and the checked build of the operating system before release.

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