Portable hard drive with ultra fast speed with buffalorsquos dynamic random access memory portable hard drive users no longer have to choose between speed and capacity the hd pgdu3 series offers both buffalorsquos ddr3 hard drives combine the best of solid state drives ndash fast speed ndash with the best of standard hard drives ndash affordable large capacities ddr3 technology the hd pgdu3 is equipped with buffalorsquos ddr3 technology and has an extra large 1gb cache capable of