NG 14 - Restore original disk signature?

When you boot from the NG CD into recovery mode, the help file describes the option to "restore original disk signature".  It says it applies Windows Server 2003 and a couple others and says "disk signatures are required".  Then there is a second paragraph saying to select this option if either of the following are true (1) atypical drive letters, (2) restoring recovery point to a blank hard drive.

 

So... if you're restoring XP Pro to a new hard drive, do you select this option?  Or does it only apply to Windows Server 2003 and the couple others?

 

Thanks,  Tom