Hi,
I'm not with my Xbox in here, so I can not do any test for now.
If the network settings are in the HDD, PedrosPad (who has a mod chip), can format C drive and and check if the network settings are in the M$ dash. If they are, e can confirm that they aren't in the HD, if not, maybe they are in HD.
First, u must make sure your backed up dash don't have the network setings.