Seagate SV35.2 Series hard drives have been optimized for the digital video surveillance industry, delivering speed, storage capacity and power savings. Seagate SV 35 Series hard drives are engineered specifically for use in digital video surveillance systems. Some features of the series include up to 750 GB capacity able to store up to 217 continuous days at 640 by 480 resolution compressed at 10 frames per second, the ability to write multiple video streams at once and greater control over operations using ATA7 streaming commands.