Canon VB-C60 - Manual (Page 32)

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System Design Concept
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Determining Required Hard Disk Capacity
Determine the required hard disk capacity as follows.
Determine the required number of Camera Servers and required video data size.
Select the Image Quality of each Camera Server.
The video quality improves in proportion to the set value, but the data volume also
becomes larger.
Determine the frame rate for recording video (i.e., the number of frames per
second).
For general security purposes, 1 to 2 fps is common. Higher frame rate requires
more hard disk space.
Determine the recording period per day and duration to retain data.
After determining the conditions above, calculate the required hard disk capacity due
to the video data size (in KB). Refer to “Example of frame sizes with VB-C60”,
“Example of frame sizes with VB-C300” and “Example of frame sizes with VB-C50i”
(
➝ P. 33).
If you record audio, to calculate the amount of hard disk space required for the audio
data. The data size for recording audio is 8 KB/s regardless of the type of Camera
Server.
When determining hard disk sizes it is important to take into account that there needs to be
considered about 10 to 20% additional room.
Example 1: JPEG recording
- Using 16 Camera Servers (VB-C60) for recording,
- With each camera set to Medium Size for video data size and Image Quality set to 50
(data size per 1 frame: 15KB),
- Recording frame rate is set at 2 fps, and
- Data size per second is approximately 30 KB (= 15 KB x 2fps).
Although actual data size depends on objects shot by each Camera Server, this
calculation assumes the typical size shown above.
- Audio recording as also performed simultaneously on 2 of the Camera Servers.
For the above configuration, when JPEG images from 16 camera servers are being
recorded continuously at 2 frames per second all day, every day, the required hard disk
space is approximately 40GB per day (=30KB x 16 cameras x 60 seconds x 60 minutes x
24 hours = 41472000KB per day).
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