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ST43401N/ND, ST43402ND User’s Manual, Rev. B 47
Table 7. LED functions for ST43402ND drives
LED indicator Function
Drive control board
Ready LED This LED flashes during the power-on sequence until
(green) the discs are up to speed and the heads are loaded.
It is on steady with power-on complete, assuming that
there are no fault conditions.
It flashes during a power-off sequence. This occurs
when the drive receives a Start/Stop Unit command
after it has once been started.
Heartbeat LED This LED blinks when the SCSI controller is operating
(green) properly.
If the LED is constantly on or off, it indicates one of two
things:
• The SCSI controller is not functioning properly.
• The SCSI controller is executing diagnostics and
should be ready in a few seconds.
Active LED This LED socket is provided for units which do not use
(socket) the optional bezel. When the active LED is inserted
into this socket, it indicates SCSI command activity.
When it is on, the drive is executing a SCSI command.
When it is off, the drive does not have a SCSI
command to execute.
Optional bezel on drive
Active LED This LED indicates command activity by the drive.
(color unspecified)
When it is on, the drive is executing a SCSI command.
When it is off, the drive does not have a SCSI
command to execute.
continued