Dell OptiPlex 755 User Manual page 194

4 Plug the free end of the eSATA cable into the eSATA connector on the system board (see "System
Board Components" on page 172).
5 Replace the computer cover (see "Replacing the Computer Cover" on page 317).
6 Boot your computer and enter system setup (see "Entering System Setup" on page 280). Use the
esata option to enable the eSATA drive.
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Expansion Cards