HIKVISION DS-7104HGHI-F1/N User Manual page 151

Select a record file or folder in the backup device and click
it.
Click Erase button if you want to erase the files from a re-writable CD/DVD.
Click Format button to format the backup device.
If the inserted storage device is not recognized:
 Click the Refresh button.
 Reconnect device.
 Check for compatibility from vendor.
Digital Video Recorder User Manual
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button if you want to delete