Canon VB-C60 - Manual (Page 35)

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System Design Concept
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Required Hard Disk Capacity
The size of the images varies depending on the configuration of the Camera Server (the settings for Quality
and Resolution) and the complexity of the actual image.
Determining Required Hard Disk Capacity
Determine the required hard disk capacity as follows.
1. Determine the required number of Camera Servers and required video data size.
2. 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.
3. 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.
4. Determine the recording period per day and duration to retain data.
5. After determining the conditions above, calculate the required hard disk capacity due to the video data size
(in KB).
6. 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 3 (data size per 1
frame: 12.5KB),
• Recording frame rate is set at 2 fps, and
• Data size per second is approximately 25 KB (= 12.5 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 33GB per day (=25KB x
16 cameras x 60 seconds x 60 minutes x 24 hours = 34560000KB per day).
When audio is recorded by 2 camera server, the required hard disk space is approximately 1.3 GB per day (=8
KB x 2 units x 60 seconds x 60 minutes x 24 hours = 1382400 KB).