QNAP TS-401T Turbo Server User Manual page 12

5. Fasten the tray with round head screws.
Note: You can install 1~4 hard disks depending on the type of disk
configuration you select for TS-401T. If less than 4 disks are installed and
the server is turned on, the system will beep continuously. In such case,
please go to Hardware Settings in System Tools (refer to Chapter 6.9.4)
and disable the buzzer. You can then continue to use TS-401T.
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