Lenovo ThinkStation P7 Manual page 44

5. Insert the lower mounting posts into the lower slots. Then, using the lower
posts as a pivot point, rotate the top of the tray down until the upper posts
latch into place in the corresponding slots on the chassis.
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6. The 3 HDD needs to be installed in a special drive carrier before being
mounted in the system. Set the drive carrier on a flat surface, upside down,
as seen in the below image. Note the position of the red handle.
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