Dell Precision Workstation 370 User's & Service Manual page 140

When connecting and disconnecting a serial ATA cable, hold the cable by the connector at each end.
NOTE: The system board serial ATA connector may have an attached cover or shroud.
Power Cable Connector
1 power cable
2 power input connector
SCSI Device Installation Guidelines
This section describes how to configure and install SCSI devices in your computer.
NOTE: The system board SCSI controller supports hard drives only. Do not connect CD or DVD drives, tape drives,
DAT drives, and so on.
SCSI ID Numbers
Internal SCSI devices must have a unique SCSI ID number from 0 to 15. If you are using the SCSI connector on the system
board and a SCSI controller card installed in your computer, you have two separate SCSI buses operating. Each SCSI bus has
a set of SCSI ID numbers from 0 to 15.
When SCSI devices are shipped from the factory, the default SCSI ID numbers are assigned as follows:
System Board Controller
Device
Controller
Boot hard drive
NOTE: There is no requirement that SCSI ID numbers be
assigned sequentially or that devices be attached to the cable
in order by ID number. If two or more devices use the same
ID, your computer may hang during POST and in SCSI BIOS.
SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the SCSI ID
Controller Card
ID Device
7 Controller
0 Boot hard drive
CD or DVD drive
tape or DAT drive
ID
7
0
5
6