Q-See QSC26404 user manual Appendix B HDD Capacity Calculation, = d i ⎟ 8⋅ 3600 ⎟1024

QSC26404 User’s Manual

Appendix B: HDD Capacity Calculation

To calculate total capacity needed by each DVR according to video recording (video recording type and video file storage time).

Step 1: Use Formula (1) to calculate storage capacity qi that is the capacity of each channel

needed for every hour: unit Mbyte.

qi = di ⎟ 8⋅ 3600 ⎟1024 (1)

In the formula: di means the bit rate, unit Kbit/s

Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the

storage capacity mi , which is the storage needed by each channel: unit Mbyte.

	mi = qi × hi × Di	(2)
	In the formula:
hi	represents the recording time for each day (hours)
Di	represents the number of days for which the video will be kept
Step 3: Use Formula (3) to calculate total capacity (accumulation) qT		that is needed for all
channels in the DVR during scheduled video recording.

c

qT = ∑ mi

i=1

In the formula: c represents total number of channels in one DVR

Step 4: Use Formula (4) to calculate total capacity (accumulation) qT that is needed for channels in DVR during alarm video recording (including motion detection).

c

qT = ∑ mi ×a%

i=1

In the formula：a% represents alarm occurrence rate

(3)

all

(4)

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