Dell OptiPlex GX270 - Manual (Page 143)

11. Connect a power cable to the drive.
12. Connect a data cable to the drive.
a. If you're installing a serial ATA drive, connect the new data cable to the back of the drive and to one of the serial ATA connectors on the system
board.
b. If your first hard drive is an IDE drive and you're installing another IDE drive, locate the extra connector on the drive cable that is attached to
your first hard drive and attach the connector to the second hard drive.
IDE devices use cable-select drive cables. This means that the device connected to the end connector of the drive cable is the master device and
the device connected to the middle connector is the slave device. Be sure that the jumper setting on the new device is set for "cable select" (see
the documentation that came with the drive for information).
Cabling for Primary and Secondary IDE Hard Drives
13. Close the computer cover.
14. Connect your computer and devices to their electrical outlets, and turn them on.
15. See the documentation that came with the drive for instructions on installing any software required for drive operation.
1 rail tabs (2)
2 second hard drive in upper bay
3 first hard drive in lower bay
4 hard drive bay
NOTICE: If you are installing an IDE hard drive, match the colored strip on the cable with pin 1 on the drive.
1 power cable
2 second hard-drive cable (secondary drive)
3 first hard-drive cable (primary boot drive)
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.