Wd purple surveillance storage is built for 247 always on surveillance in high definition security systems that use up to eight hard drives and up to 32 cameras exclusive allframe technology works with ata streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems features lower power consumption intellipower sata 6 gbs 35 inch barcode 718037823331 data bufferram 64 mb depth 147 cm disk capa