IP Surveillance Storage
As IP surveillance runs on data networks, utilising computer based systems to both store and retrieve the data, we are able to use computer storage to hold the captured video. Three fundamental types of storage may be selected:
- Internal storage is the hard drives that are built inside of a DVR, NVR or server. This today is still the most common form of storage. With hard drives of up to 1 TB common today, internal storage can provide total storage of 2TB to 4TB. Internal storage is the cheapest option but tends to be less reliable and scalable than the other options. Nonetheless, it is used the most frequently in video surveillance.
- Directly Attached storage is when hard drives are located outside of the DVR, NVR or server. Storage appliances such as NAS or SANs are used to manage hard drives. This usually provides greater scalability, flexibility and redundancy. However, the cost per TB is usually more than internal storage. Attached storage is most often used in large camera count applications.
- Storage Clusters are IP based ‘pools’ of storage specialized in storing video from large numbers of cameras. Multiple DVRs, NVRs or servers can stream video to these storage clusters. They provide efficient, flexible and scalable storage for very large camera counts. Storage clusters are the most important emerging trend in video surveillance storage. Learn more about
CCTV footage is analogue and is stored on VCR tapes or other analogue storage systems. This leads to data degredation over time as well as degredation through viewing and copying.