The built-in RV sensor enables the driver to maintain performance in multi bay systems, providing flexibility for expanding the system when more storage is needed3TB Capacity, IntelliPower (5400RPM~7200RPM) Rotation Speed, 64MB Cache.The Internal HDD is designed for 24/7 Operation, Lower Power consumption & Heavy Duty, Cool Temperature.The surveillance hard drive works for Servers, PC, Mac, RAID, NAS, and compatible with the Hiseeu asin: B08LQJJPFC、B0819ZHF5C、B0B9G7TZFS、B07LGLVS4M、B07FR1LDSM.3.5" Internal Hard Drive, SATA III 6.0Gb/s, Bulk single pack, Not include cable, screws or accessories.