Dell PowerVault 770N (Deskside NAS Appliance) - Manual (Page 49)

Installing an External SCSI Tape Drive
This section describes hot to configure and install an external SCSI tape drive.
Interface Cables
You must connect external SCSI devices to a SCSI host adapter expansion card. See " Expansion Cards " for information on
installing expansion cards.
SCSI interface connectors are keyed for correct insertion. Keying ensures that the pin-1 conductor in the cable connects to
pin-1in the connectors at both ends.
When you disconnect an interface cable, take care to grasp the cable connector, rather than the cable itself, to avoid stress on
the cable.
SCSI Configuration Information
Although SCSI devices are installed in essentially the same way as other devices, their configuration requirements are
different. To install and configure an external SCSI device, follow the guidelines in the following subsections.
SCSI ID Numbers
Each device attached to a SCSI host adapter must have a unique SCSI ID number from 0 to 15.
A SCSI tape drive is configured by default as SCSI ID 6.
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.