Re: Have I reached my limit?
No, the "disk is full" message is a system message, nothing to do with your account directly. The storage space that you're sharing with everybody is full (or nearly full) at the moment, and it will take the staff some time to delete temp files, error logs (and, no doubt, clean up some accounts that are in violation of the terms) in order to recover enough space for you to upload things. Please be patient.
“Beware of bugs in the above code; I have only proved it correct, not tried it.” --Donald Knuth
"It was as if its architects were given a perfectly good hammer and gleefully replied, 'neat! With this hammer, we can build a tool that can pound in nails.'" -- Alex Papadimoulis (on TheDailyWTF.com)