Hello, I found the following code writing in C++ on forum.sysinternals.com/forum_posts.asp?TID=6643&PN=2, it can get the serial number on a hard drive, but I got problem to compile under MS VS 6, I have serveral unknow varaiables like "error C2065: 'VOLUME_DISK_EXTENTS' : undeclared identifier". I think it missing files ". h" to include in program ! Thanks in advancve for your help . Amen.