Charles I have checked some of the debug messages and added a few of my own. It seems that the object header sum field output by mkyaffsimage is 0xffff, clearly not what was intended. It seems that yaffs_SumCompare is always true under Windows so that may be why the problem wasn't spotted. Its still not perfect yet. Nick --------------------------------------------------------------------------------------- This mailing list is hosted by Toby Churchill open software (www.toby-churchill.org). If mailing list membership is no longer wanted you can remove yourself from the list by sending an email to yaffs-request@toby-churchill.org with the text "unsubscribe" (without the quotes) as the subject.