Western Digital Purple 12TB 3.5” SATA Surveillance Internal HDD Key Features 12TB Internal Surveillance HDD 7200 rpm Rotation Speed Designed for 24/7 Security Cameras SATA 3 Interface 3-Year Limited Warranty Overview WD Purple Surveillance Storage offers exclusive AllFrame technology to bring you premium reliability and peace-of-mind when installing your home or small to medium business security system. WD Purple’s exclusive firmware upgrades work with ATA streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems. This drive is built for 24/7, always-on, high-definition surveillance security systems that use up to eight hard drives and up to 64 cameras. Specifications Disk Type HDD Surveillance External? No Capacity 12TB Rotation Speed 7200 rpm Cache 256MB Transfer Rate up to 150MB/s Interface SATA 3 Compatibility Surveillance Dimensions 147 x 102 x 26 mm