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The Main/Call monitor displays selected live or recorded cameras in any available format. 2.4 BOOT UP EDR1640/1620/920 (1) Insert a HDD (IDE) for Video Storage Insert a HDD(IDE) for Video Storage. The HDD should be set as MASTER. After hard disk case is inserted into the hard disk tray, be sure to turn the tray key in lock position. Otherwise, HDD will not be detected. Note: A HDD has to be installed before EDR1640/1620/920 is booted, or the EDR1640/1620/920 will not detect a HDD until you reboo