HIKVISION DS-9204HWI-ST - 7.4 Hot Spare Backup

User Manual of Digital Video Recorder
125
For USB Writers and DVD-R/W:
Click the button Erase, and you can erase the files from a re-writable CD/DVD.
If the inserted device is not recognized, you can perform the following steps:
 Click the button Refresh.
 Reconnect device.
 Check for compatibility from vendor.