Appendix A Hdd Capacity Calculation - Dahua NVR608-32-4K Manuel D'utilisation

5 Appendix A HDD Capacity Calculation

Calculate total capacity needed by each device according to video recording (video recording type and
video file storage time).
Step 1: According to Formula (1) to calculate storage capacity
needed for each hour, unit Mbyte.
Step 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.
Step 3: According to Formula (3) to calculate total capacity (accumulation)
channels in the device during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
channels in device during alarm video recording (including motion detection).
Note
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This manual is for reference only. Slight difference may be found in the user interface.
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In the formula: means the bit rate, unit Kbit/s
In the formula:
means the recording time for each day (hour)
means number of days for which the video shall be kept
In the formula: means total number of channels in one device
In the formula：a% means alarm occurrence rate
that is the capacity of each channel
= × ×
c


q m
T i

i 1
×a%
that is needed for all
that is needed for all
264
(1)
(2)
(3)
(4)