Seagate ST43402ND, ST43401N/ND user manual LED or indicator, Operating instructions, Function

48	ST43401N/ND, ST43402ND User’s Manual, Rev. B
continued from previous page
LED or indicator	Function
SCSI I/O board
SCSI port A enabled	This LED is on steady when port A is enabled to
(green)	receive SCSI commands and to transfer data on
	this port.
SCSI port B enabled	This LED is on steady when port B is enabled to
(green)	receive SCSI commands and to transfer data on
	this port.
SCSI port A active	This LED is on when port B is actively executing a
(red)	SCSI command.
	This LED is off when port B does not have a SCSI
	command to execute.

Operating instructions

Following initial checkout, the drive normally requires no attention from the operator. DC power is available to the drive, as the On/Standby switch on the power supply is normally left in the On ( l ) position.

If you wish to verify that the drive has completed its power-on sequence, access the drive and then check that its Ready LED is on steady and that the Heartbeat LED is blinking (see Figure 22 for ST43401N/ND drives or Figure 23 for ST43402ND drives).

If the Start Command option was selected (using a circuit board jumper), the Stop/Start Unit command must be used to start and stop the drive.

If the Start Command option was not selected, once the drive has been started, the Stop/Start Unit command can be used to stop and later restart the drive.