User`s guide

Installing a SCSI Drive
Your computer supports a variety of single-ended SCSI devices.
If you plan to install one to four SCSI drives, use only the SCSI
(lower) internal bays. If you plan to install more than four, you
can install the fifth and sixth drives in the upper internal bays
or in the external drive bays, if the drives use removable media.
Before you begin, locate two slide rails and two grounding clips
for each drive you will install. These items came in the box with
your computer. Also locate four screws for each drive; these are
supplied by your drive manufacturer.
If you plan to install four SCSI drives in the lower internal bays,
install them in the following order: bays 1,2,3, and 4, as shown
below. However, if you are installing fewer than four SCSI
drives, begin with bay 4 and work down. This optimizes
cooling and airflow inside your computer.
bay 2.
I
bay 1
7-18 Installing and Removing Disk Drives