Optiview DVRJ4 - Manual (Page 30)

DVRJ4
This is for USB backup. This DVR supports a variety of USB thumb drives. You can also use
USB drive for firmware upgrade.
O USB TOTAL SIZE : 256 BYTE
O USEFUL SIZE : 256 BYTE
O FIRMWARE UPDATE
5.7. Backup menu
USB BACKUP SETUP
USB backup setting
You can use arrow buttons to adjust.
It shows the total capacity of the USB thumb drive
hooked in.
You can use this function when you try to update the
firmware. After update, you need to turn the system off
and turn it on.
It shows available space.
User’s manual