DVR systems NVR38xx Series - Manual (Page 108)

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Figure 8-39 HDD Management
Please refer to the following sheet for detailed information.
Parameter Function
Format Clear data in the HDD.
Read/write Set current HDD as read/write
Read only Set current HDD as read.
Redundant Set current HDD as redundant HHD.
Recover Fix the HDD error. Right now the device does not support this
function.