Easily expand the capacity of AXIS S11 and S12 Recording Servers. Add 4TB of extra storage to your recording server with Enterprise Hard Drive 4 TB. Designed and tested for 24/7 video surveillance, Enterprise Hard Drive 4 TB is made 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. RAID technology provides redundancy and protection against data loss. It's part of an affordable, end-to-end Axis solution with unbeatable reliability. How much storage do you need? You can use AXIS Site Designer to estimate your storage needs and help you choose which hard drive should be used together with your product.