User's Manual
343
Appendix 2 HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording (video recording type and
video file storage time).
Procedure
Step 1 According to Formula (1) to calculate storage capacity that is the capacity of each channel
needed for each hour, unit MB.
In the formula: means the bit rate, unit Kbit/s
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 MB.
In the formula:
●
means the recording time for each day (hour)
●
means number of days for which the video shall be kept
Step 3 According to Formula (3) to calculate total capacity (accumulation) that is needed for all
channels in the DVR during scheduled video recording.
In the formula: means total number of channels in one DVR.
Step 4 According to Formula (4) to calculate total capacity (accumulation) that is needed for
all channels in DVR during alarm video recording (including motion detection).
In the formula: means alarm occurrence rate.
You can refer to the following table for the file size in one hour per channel. (All the data
listed below are for reference only.)
Appendix Table 2-1 HDD capacity calculation
Bit Stream Size
(max)
File Size
Bit Stream Size
(max)
File Size
96 Kbps 42 MB 128 Kbps 56 MB
160 Kbps 70 MB 192 Kbps 84 MB
224 Kbps 98 MB 256 Kbps 112 MB
320 Kbps 140 MB 384 Kbps 168 MB
448 Kbps 196 MB 512 Kbps 225 MB
640 Kbps 281 MB 768 Kbps 337 MB
896 Kbps 393 MB 1024 Kbps 450 MB
1280 Kbps 562 MB 1536 Kbps 675 MB
1792 Kbps 787 MB 2048 Kbps 900 MB
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