System can be used for PVR Video or Security recording. 24 Hour operation; brand new Western Digital HD Hard Drive - 2 TB mechanical_hard_drive Number of USB 2.0 Ports - 1 Brand Name - Western Digital Series - WD Purple 2TB Surveillance Hard Disk Drive - 5400 RPM - 5400 Class - SATA 6 Gb/s 64M Item model number - WD20PURZ Operating System - Windows/Mac Color - Purple New Generation Surveillance HDD Flash Memory Size - 2 TB Hard Disk Interface - Serial ATA StarTech Housing USB 3.0 / eSTAT 6MB/sec