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System Design Concept
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Determining Hard Disk Capacity
Determine the hard disk capacity as follows.
Determine the required number of Camera Servers and video resolution.
Determine the quality of each Camera Server.
Higher quality causes larger data per frame.
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
according to the video data size per screen (in KB). Refer to “Example of Frame
Sizes with VB-C300” and “Example of Frame Sizes with VB-C50i” (➝ P. 31).
Example:
- Recording continuously at 2 fps,
- Using 16 Camera Servers (VB-C50i) for recording,
- With each camera set to Medium Size for video capture and Quality set to 50, and
- Frame size* per single frame is approximately 15 KB.
Although actual data size depends on objects shot by each Camera Server, this
calculation assumes the typical size shown above.
For the above configuration, if the 16 Camera Servers are being recorded continuously at
2 frames per second all day, every day, the disk requirements would be approximately
40GB per day (15KB x 2fps x 16 cameras x 60 seconds x 60 minutes x 24 hours =
41472000KB per day).
However, when determining hard disk sizes it is important to take into account that there
needs to be some room (10 to 20%).
* For the above figures please note that the bandwidth is calculated as 1000Kbps =
1Mbps, and the disk size as 1024KB = 1MB.
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