Lenovo 10A4 Hardware Maintenance Manual page 206

Figure 173. Positioning the carrier onto the bottom of the primary hard disk drive bay
7. Slide the secondary hard disk drive carrier to the left of the chassis until it snaps into position and the
screw hole 1 in the carrier is aligned with the screw hole
Figure 174. Installing the secondary hard disk drive carrier
8. Install the screw to secure the secondary hard disk drive carrier to the chassis.
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ThinkCentre M83 and M93/p Hardware Maintenance Manual
2 in the bay.