Vivitar DVR 830XHD - Manual (Page 65)

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Format
Formatting the internal memory of the camera or of the SD Memory card if
there is one inserted. All the saved data files sitting in the memory will be wiped
off.
Important: Please download all data before using this feature.
1. Push the OK joystick button Up/Down to select the Format mode.
2. Push the OK joystick button Right for the Format options to appear:
Yes , No.
3. Push the OK joystick button Up/Down to highlight and select the Format
option you desire.
Caution: There is no Format Confirmation message before the memory is
formatted. This process it irreversible and all the data will be lost forever if
it is not downloaded to your PC before formatting the memory.
4. If your desire is to format the memory, select Yes and press the OK button
to confirm and begin the formatting.
Default Setting