Only the USG6510E/6510E-POE/6530E support this command.
The device requires that the SD card file system must be in ext4 format. Incorrect format will cause the SD card file system to fail to be mounted. You can run the display sd-card information command to check whether the SD card file system is mounted. If not, run the reset sd-card command to format the SD card.
After the SD card is formatted, all files on the SD card are lost and cannot be recovered. When the file system is well mounted, exercise caution on using this command.