Grace notes
Dietz Grace Notes is the database build into the Radio/HDD system of the entertainment package that identifies CDs when you put them into the car and when you rip them from the car. If it doesnt get updated then overtime new CDs stored inthe computer sometimes give you useless information when stored like "CD 1 song 1" starts to make the HDD storage useless. If there isnt a way to update this, it was not very well thought out by GM then.