Dell OptiPlex 755 - Manual (Page 56)

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User's Guide
Drives
Drives
Your computer supports:
l One SATA (serial ATA) hard drive
l One 3.5-inch drive bay (to support a floppy drive, media card reader, or optional second SATA hard drive)
l One SATA optical drive
l One eSATA drive (with optional bracket)
General Drive Installation Guidelines
SATA connectors on the system board are labeled SATA0, SATA1, and SATA2. Hard drives must be connected to the lower-numbered SATA connectors. Any
other SATA device (like an optical drive) must be connected to the remaining SATA connectors numbered higher than the one that the hard drive(s) is
connected to. For example, if you have two SATA hard drives and one SATA optical drive, connect the two hard drives to the SATA0 and SATA1 connectors, and
connect the SATA optical drive to the SATA2 connector. (See
System Board Components for the location of the SATA connectors on the system board.)
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
NOTE: Due to the limited number of drive bays and controllers on this computer, you will not be able to connect all supported devices at once.
NOTE: If you will be operating your computer without an optical drive or a 3.5-inch device (floppy drive or media card reader) installed, the appropriate
drive bay insert must be installed in place of the drive. Contact Dell if you need a drive bay insert.
1 optical drive
2 floppy drive
3 hard drive
SATA Connector