Dell External OEMR XL T620 Owner's Manual page 64

Figure 26. Cabling—Optical Drive and Tape Drive
1. internal tape adapter
2. mini-SAS/SATA connector on internal tape
adapter
3. ODD2/TBU connector on system board
4. ODD1/TBU connector on system board
5. power connector on x16 backplane
6. SAS tape drive data/power connector
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7. optical drive 2 power connector
8. optical drive 2 data connector
9. optical drive 1 power connector
10. optical drive 1 data connector