Product manual

Barracuda 2LP Product Manual, Rev. D 47
10.0 Option/configuration headers
This section describes how to configure Barracuda 2LP drives using the
option headers on the drives. These option headers may be used to
customize many functions of the drives for your particular system.
10.1 Drive ID/option select headers
The headers described in this section enable you to configure the drive to
meet specific functionality requirements.
To configure N/ND drives, see Section 10.1.1.
To configure W/WD drives, see Section 10.1.2.
To configure WC/DC drives, refer to Section 10.1.3.
10.1.1 ST31250N/ND and ST32550N/ND configuration
Figure 19 illustrates ST31250N/ND and ST32550N/ND jumper connectors.
J2
J4
ST31250N and
ST32550N
J1 Connector
ST31250ND and
ST32550ND
J1 Connector
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
Remote 
LED connector
Spindle sync 
cable connector
J4
J1
Pin 1
Pin 2
Pin 1
Pin 1
Reserved
Ground (cathode)
Positive (anode)
Spindle Sync Reference
Spindle Sync Ground
SCSI ID = 0
(default)
(front view of J4)
Pin 2
Disable Parity
Write Protect
J2
Pin 1
Enable 
Motor Start
Pin 2
Delay 
Motor Start
Term. power from
drive (default)
J1
Pin 1
Pin 2
ST31250ND and
ST32550ND
ST31250N and
ST32550N
Term. power to 
SCSI Bus (default)
Term. power to 
SCSI bus
Term. power from 
SCSI bus
Term. power to 
SCSI bus and drive
Enable SCSI 
terminator (default)
Reserved
Pin 1
Pin 1
Pin 1 End
Pin 1
Figure 19. ST31250N/ND and ST32550N/ND jumper connectors