I have an XPS 400  with 2 X 160GB hard drives running Norton Ghost 10.0.  The very first time I try to create a restore point I get the error message 'target disk full'.  How can the target disk be full when it is 160GB?  My C drive only has 35GB worth of programs/files on it.  It says I only have room for 18GB on the ghost D drive.  Am I missing something obvious?