User`s manual

Configuration DR3 using LCD Menu
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Enter menu, select CF CARD option, then select TEST item, DR3 will test write &
read performance of CF card that you insert into DR3.
After testing finish, DR3 will display process of testing, it will test WRITE
performance in first, then test READ performance, after testing finish, DR3 will reboot.
If DR3 display PASS message on screen, it means current CF card can match
performance requirement of DR3, you can use this CF card securely.