Reviewed, sourced guidance
Check CCTV recorder bandwidth separately from disk space
Direct answer
Sum the configured rates for streams expected to arrive concurrently as a first incoming-throughput check, then compare them with the exact recorder limit. Separately check decoding capability and retained video data; they answer different questions.
Storage estimates describe accumulated video data. Recorder throughput describes data arriving at the device; neither number proves a particular recorder can support the design.
Key takeaways
- Add simultaneous stream rates for a first throughput check.
- Calculate stored data over time as a separate measure.
- Check which bandwidth figure a product specification describes.
- Do not infer compatibility from a disk-size result.
Recorder specification checks to record
Use the exact model and firmware documentation. A disk estimate alone cannot establish recorder compatibility.
Version: 2026-09-27-v1
- Exact recorder model, firmware and supported camera/channel count
- Space for written notes
- Maximum incoming recording bandwidth and how the manufacturer defines it
- Space for written notes
- Total bitrate of streams expected to arrive at the same time
- Space for written notes
- Per-channel decoding limits for the required resolution and frame rate
- Space for written notes
- Outgoing bandwidth limits for live view, playback and remote users
- Space for written notes
- Supported drive models, bay count, maximum capacity and RAID options
- Space for written notes
- Usable capacity after the selected storage layout and reserved space
- Space for written notes
- Network-link and PoE limits checked separately from recorder throughput
- Space for written notes
Throughput and storage answer different questions
Throughput is a rate at a point in time. Storage is accumulated data over recording hours and days.
The Seagate tool presents camera-group throughput and total storage as separate outputs, which is a useful distinction when comparing a proposed system.
Sources for this section: Seagate UK, video storage calculator for surveillance (observed 2026-09-25; manufacturer tool)
Check the exact recorder specification
Product specifications can list incoming and outgoing network bandwidth separately and state decoding capability as a different measure. The cited Hikvision model is one example, not a universal recorder specification; compare the exact model and recording mode.
Also check whether more than one stream or audio is stored. The calculator includes only the per-camera bitrate values entered.
Sources for this section: Hikvision, DS-9616NXI-I8R/VPro NVR data sheet (observed 2026-09-25; model-specific example only)
Next steps
- Read the recorder specification for the exact bandwidth limit and definition.
- Keep the aggregate-rate check separate from storage and capacity checks.