Q-See QSNDVR16M User Manual page 11

Primary ATA interface is HDD A, the slave is HDD B. The master HDD connected to secondary ATA interface
is HDD C, the slave is HDD D.
The record sequence is: HDD A→HDD B→HDD C→HDD D
Overwrite sequence: The sequence is irrespective of HDD. The DVR overwrites HDD from the oldest record
file when HDD is full.
Operation
Put the HDD into the HDD fixation rack. If the user wants to install more than two HDD, please
install the HDD into the bottom rack first.
Attach the HDD by two screws on both sides
Connect the HDD cable. There are three interfaces on cable and each of them can be connected with
the master HDD or the slave HDD, motherboard. (There are 39 pins in two rows, 20 pins are in one row and
Motherboard
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