WSTRN DIG Drive SATA300 2TB 64MB 54RPM Green AV-GP 64 MB Buffer 3.5" WD20EURS 2 Terabyte of storage capacity SATA 3G interface 3.5-inch Hhard drive form factor Built for 24/7 operation These drives are designed to last in always-on, streaming digital audio/video environments such as PVRs, DVRs and surveillance video recorders.