JHCTech ALAD-K2120T(P) User Manual page 28

Step 2.Screw the HDD/SSD on the drive bay though 4 M3*5mm cross recessed countersunk head
screws .
Step 3.Push the drive bay into the SATA connector, and screw 2 M3*4mm screw to lock drive bay .
Figure 2.25
Figure 2.26
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User's Manual