xbox360 can't see mybook world edition

Okay, a week ago my xbox360 saw the mybook worlb edition just fine.  Now it doesn’t see it all.  I have changed nothing on my network, and can still see it through my PC and mac, but not with xbox360.  How can I fixthis?

Check if resetting the router helps.

To factory settings?  Isn’t there a way to check if folders are shared?  As resetting router would knock out all settings.

Well I mean just to turn the router OFF an ON, that will not affect any of the my book settings. From the my book dashboard you can check what folders you are sharing.

It says public shares are disabled, can’t find how to enable this.  Where is the option?