Lenovo ThinkStation P520 Hardware Maintenance Manual page 138

5. To install a 3.5-inch storage drive, ensure that the conversion bracket is unfolded. To unfold the bracket,
do the following:
a. Remove the pin
Figure 62. Removing the pin and installing it into the new slot
b. Release tabs 1 ,
Figure 63. Releasing tabs from the corresponding slots
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P520 Hardware Maintenance Manual
1 and install it into the slot
2 , and 3 from the corresponding slots.
2 .