Appendix 2 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 qi
⚫ that is the capacity of each
channel
⚫ needed for each hour, unit
Mbyte.
q
i
d
i
8 3600 1024
⚫ (
1
)
⚫ In the formula: d
i
⚫ means the bit rate, unit Kbit/s
⚫ Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the storage
capacity m
i
, which is storage of each channel needed unit Mbyte.
m
i
= q
i
× h
i
× D
i
⚫ (2)
⚫ In the formula:
⚫ h
i
means the recording time for each day (hour)
⚫ D
i
means number of days for which the video shall be kept
⚫ Step 3: According to Formula (3) to calculate total capacity (accumulation) qT
⚫ that is needed for
all
channels in the device during scheduled video recording.
c
q
T
=
m
i
i=1
⚫ (3)
⚫ In the formula: c means total number of channels in one device
⚫ Step 4: According to Formula (4) to calculate total capacity (accumulation)
⚫ q
T
that is needed for
all
channels in device during alarm video recording (including motion detection).
c
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