24 ST12450W/WD Installation Guide, Rev. B

Figure 6b. Additional jumper options

J4

EDT
RES
PAR
Reserved for future use.
Reserved (RES)
Enable motor start. This makes the drive wait for 
the Start Unit command from the host before starting 
the spindle motor.
Motor Start option (MTR)
Disable motor start. This causes the drive to start 
according to the Delay Motor Start option setting 
as described below (default).

J01

Pin 1

J4

MTR
DMS
WP
Enable parity check of SCSI bus data.
Parity Check option (PAR)
Disable parity check of SCSI bus data (default).
Motor start delay equal to the SCSI ID multiplied 
by 10 seconds , plus 3 additional seconds max. 
For example, if the SCSI ID = 2, the drive will delay 
for 23 seconds before starting.
Delay Motor Start option (DMS)
(valid only if the Motor Start option is disabled)
Disable the delay motor start option (default).
Write Protect = On (disables writing).
Write Protect option (WP)
Write Protect = Off (enables writing – default).
RES
RES