Appendix B HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording (video
recording type and video file storage time).
Step 1: According to Formula (1) to calculate storage capacity
that is the
capacity of each channel needed for every hour, unit Mbyte.
(1)
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 Mbyte.
=
×
×
(2)
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.
(3)
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).
×a% (4)
In the formula: a% means alarm occurrence rate
