Appendix 1 Hdd Capacity Calculation - Dahua N41C1P User Manual

Appendix 1 HDD Capacity Calculation

Calculate the total capacity needed by each device according to video recording (video
recording type and video file storage time).
1. According to Formula (1) to calculate storage capacity
In the formula:
2. After video time requirement is confirmed, according to Formula (2) to calculate the
storage capacity
In the formula:
means the recording time for each day (hour)
means number of days for which the video shall be kept
3. According to Formula (3) to calculate total capacity (accumulation)
all channels in the device during scheduled video recording
.
In the formula:
means total number of channels in one device
4. According to Formula (4) to calculate total capacity (accumulation)
all channels in device during alarm video recording (including motion detection)
.
In the formula:
channel needed for each hour, unit Mbyte.
means the bit rate, unit Kbit/s
, which is storage of each channel needed unit Mbyte.
means alarm occurrence rate
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that is the capacity of each
that is needed for
that is needed for