Add 4TB of extra storage to your AXIS S22 Appliance Series with Surveillance Hard Drive 4TB. Designed and tested for 24/7 video surveillance, Surveillance Hard Drive 4TB is made for ultra-high-definition continuous or event-triggered recording. If you add Surveillance Hard Drive 4TB to an AXIS Camera Station S2216 Appliance, you also have the option of using RAID 5 technology. RAID 5 provides redundancy and protection against data loss as well as exceptionally efficient use of your storage capacity. It’s part of an affordable, end-to-end Axis solution with unbeatable reliability.