HIKVISION DS-9608NI-I8 User Manual page 118

Step 4 Click OK to save settings and back to the upper level menu.
 You cannot save any files in a Read-only HDD. If you want to save files in the HDD, change
the property to R/W.
 If there is only one HDD and is set to Read-only, the NVR can't record any files. Only live
view mode is available.
 If you set the HDD to Read-only when the NVR is saving files in it, then the file will be saved
in next R/W HDD. If there is only one HDD, the recording will be stopped.
Network Video Recorder User Manual
117