Dahua N41C1P, User Manual, Page: 362 / 377

User's Manual
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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 that is the capacity of each
channel needed for each hour, unit Mbyte.
In the formula: means the bit rate, unit Kbit/s
2. After video time requirement is confirmed, according to Formula (2) to calculate the
storage capacity , which is storage of each channel needed unit Mbyte.
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) that is needed for
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) that is needed for
all channels in device during alarm video recording (including motion detection)
.
In the formula: means alarm occurrence rate