can't account for hard drive usage

I'm not that up on sector mapping however i do have ghost which has a utility that allows rebuilding of damaged or corrupt sectors,tho when i say damage i mean stuffed up mapping not the metal disc itself,sectors when listed appear as numbers in a way i spose you could call them blocks,the question now is if windows can't see them what stops those parts being written too by windows ,it may pay to do a bit more web searching or contact support to see if the rx can take up space that windows can't see,or perhaps the guys here can help since they specialize in imaging it's a long shot but ya never know

http://radified.com/cgi-bin/yabb2/YaBB.pl

 

Thank-You for all you time and help. really appreciate it.....