CCTV Camera Pros Geovision 8.4 Multicam Digital Surveillance System - Manual (Page 56)

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„ Set Test Time: The system will process a real-time test recording based on the time you set.
For example, if you enter 24 hours here, it will take more than one day to do the test recording.
So avoid entering the longer test time to save you time.
„ Set Expected Recording Time: Enter the time you wish for recording.
3. Click the Calculate tab to see the result.
Note:
1. A calculation difference by ± 5 % from actual disk usage is expected.
2. This function is not available to the GV-NVR users.