Vivitar DVR 830XHD - Manual (Page 52)

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3. Push the OK joystick button Up/Down to highlight and select the Delete All
option you desire.
4. Press the OK button to confirm.
5. If you choose Yes, all the unlocked files are now deleted.
Important: The files are deleted without a confirmation message. Please use
this feature with caution as deleted files cannot be recovered unless they have
been downloaded to the PC first.
6. The deletion is processed and thereafter the camera reverts back to the Playback
mode.
Lock
This mode is used to protect files from accidentally being deleted
1. Select a file in the Playback mode.
2. Press the Menu button.
3. Push the OK joystick button Up/Down to select the Lock mode from the menu
that appears.