$D$ hadronic branching fractions

The CLEO-c experiment at the CESR $e^+ e^-$ collider has collected 281 pb$^{-1}$ of data at the $\psi(3770)$ resonance, producing 1 million $D^0 \overline{D}^0$ and 0.8 million $D^+ D^-$ events. By exploiting the pair production of these charmed mesons, we can determine their absolute hadronic branching fractions without using the luminosity of the sample. We have previously measured branching fractions for the $D^0$ and $D^+$ from 56 pb$^{-1}$ of data; here we report preliminary updates to these measurements from the 281 pb$^{-1}$ sample now available.