CCTV Storage Calculator Guide: H.265+ Compression and RAID Selection
How to accurately size surveillance hard drives for 4K 8MP cameras using smart bitrate controls.
Sizing Hard Drives for Modern 4K CCTV Systems
Storage calculations can make or break a commercial CCTV quote. Underestimating storage causes critical footage to be overwritten prematurely, while overestimating adds unnecessary hardware cost.
Understanding H.265+ vs Standard H.264
| Codec | 4K 8MP @ 15fps | 30-Day Storage (4 Cameras) | |---|---|---| | H.264 | ~12 Mbps | ~15.5 TB | | H.265 Standard | ~6 Mbps | ~7.8 TB | | **H.265+ Smart Codec** | **~2.5 Mbps** | **~3.2 TB** |
Hikvision and Dahua proprietary smart codecs (H.265+ and Smart H.265) utilize dynamic GOP (Group of Pictures) and background reference subtraction to achieve up to **70% bandwidth savings** in static scenes.
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