HP ProLiant ML350 G6 User Manual page 61

The "2LFF" labeled connector to the optional hard drive cage
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Thread the LED and SAS/SATA controller cables through the optional drive cage bay.
7.
Slide the optional hard drive cage about three-fourths of the way into the bay, leaving room to connect
8.
cables at the back of the drive cage.
Connect the following cables:
9.
The system power cable to the optional hard drive cage
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The LED cable from the optional hard drive cage to the primary hard drive cage
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Hardware options installation 61