How many quota errors are there? These are the ones I've found so far.

403 - Not enough quota to create a calendar => need to wait 24 hours before creating a calendar

403 - Karma exhausted during event 403 - User has modified too many events today 403 - The user has exceeded their quota, and cannot currently perform this operation => need to wait 24 hours before making any more changes

500 - Cannot access the calendar you requested (returned in HTML) => calendar is too large to be queried via gData

Any others? What's the error for the total amount of space being