Enterprise Hard Drive 4 TB is a 3.5-inch internal hard drive designed and tested for 24/7 reliable video surveillance. It is optimized for ultra-high-definition continuous or event-triggered recording at high workloads. Enterprise Hard Drive 4 TB can be added to an existing RAID array composed of drives of the same capacity. It is suitable for storage expansion of most products in AXIS S11 Series and AXIS S12 Series. Storage needs can be estimated with AXIS Site Designer and appropriate recommendation will be provided. Enterprise Hard Drive 4 TB is sold together with the HDD tray.