Dell Dimension 8300 - Manual (Page 17)

c. Gently slide the first hard drive into the lower bay until you hear or feel a click.
d. Reconnect the power and hard-drive cables to the back of the first hard drive.
10. Gently slide the new hard drive into the upper bay until you hear or feel a click.
11. Connect a power cable to the drive.
12. 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.
Your computer uses 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).
13. Close the computer cover .
14. Connect your computer and devices to 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.
Adding or Replacing a Floppy Drive
1. Shut down the computer through the Start menu.
NOTICE: Match the colored strip on the cable with pin 1 on the drive.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in your Owner's Manual.