Hard drive and storage kits are available for all MAXPRO NVRs as noted below. Please refer to the individual MAXPRO NVR datasheets or the Ordering tab for the correct SKU numbers for storage option upgrade kits, channel licenses, and software maintenance agreements for your region. The HERN Network Attached Storage (NAS) appliances, offered in a variety of configurations as a Network Attached Storage (NAS) or Storage Area Network for recording and archiving applications with MAXPRO NVR. These appliances provide support for RAID 5 and RAID 6 for protection from a catastrophic single or double drive failure.