Dell OptiPlex 755 User Manual page 237

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User's Guide
Drives
Drives
Your computer supports:
One SATA (serial ATA) hard drive
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One optional Dell D-module optical drive, second hard drive, or floppy drive in the module bay (See
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removing devices in the module bay.)
General Installation Guidelines
NOTE: For information on installing D-module drives, see the documentation that came with your optional device.
Connecting Drive Cables
When you install a drive, you connect two cables—a DC power cable and a data interface cable—to the back of the drive.
Data Interface Connectors
SATA Connector
1 data interface cable connector
2 data interface connector
Power Cable Connectors
1 power cable
2 power input connector
Module Bay for information on installing and