title: Where can I find IOCTL constant values?
body: <p>I need to know the IOCTL constants for the various strings (for example the value of the constant of IOCTL_ATA_PASS_THROUGH). Searching the net I found that those constants are defined in the header Ntddscsi.h but those constant are wrong. For example the constant value of IOCTL_ATA_PASS_THROUGH should be 4D02C while in the header file it is 40B</p>
  
  <p>The question is: where can I find a list with ALL the right values?</p>
  
  <p>Thanks</p>
  
  <p>EDIT:</p>
  
  <p>I've found <a href="http://www.ioctls.net/" rel="nofollow">http://www.ioctls.net/</a> where there are listed all the codes. Thanks anyway for the explanation of why the value in Ntddscsi.h is not the "final" value</p>