Dell Precision Workstation 370 User's & Service Manual page 139

Connect hard drives to the connector labeled "SATA" and connect CD/DVD drives to the connector labeled "IDE".
Serial ATA hard drives should be connected to the connector labeled SATA on the system board. IDE CD/DVD drives should be
connected to the connector labeled IDE.
When you connect two IDE devices to a single IDE interface cable and configure them for the cable select setting, the device
attached to the last connector on the interface cable is primary or the boot device (drive 0), and the device attached to the
middle connector on the interface cable is the secondary device (drive 1). See the drive documentation in your upgrade kit for
information on configuring devices for the cable select setting.
Connecting Drive Cables
When you install a drive, you connect two cables—a DC power cable and a data cable—to the back of the drive and to the
system board. Some CD/DVD drives may also have an audio connector; one end of the audio cable will attach to the drive
connector and the other will attach to the system board.
Drive Interface Connectors
Serial ATA Connector
1 interface cable
2 interface connector
Most connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a filled-in
hole on the other connector.
When connecting an IDE cable, ensure you align the colored stripe with the pin 1 connector. When disconnecting an IDE cable,
grasp the colored pull tab and pull until the connector detaches.