Sun Microsystems Enterprise 250 Owner's Manual page 177

Figure 7–15
6. Connect the SCSI data and power cables to their corresponding connectors at
the rear of the drive.
The connectors are keyed so that they install in only one way.
Figure 7–16
Note - Wide SCSI removable media devices require a 68-to-50 pin SCSI adapter.
These devices only operate in narrow SCSI mode.
Removing and Installing Storage Devices
143