ST43401N/ND, ST43402ND User’s Manual, Rev. B | 45 | ||
Table 6. LED functions for ST43401N/ND drives |
| ||
LED indicator | Function |
| |
Drive control board |
|
|
|
Ready LED | This LED flashes during the | ||
(green) |
| the discs are up to speed and the heads are loaded. | |
| It is on steady with | ||
| there are no fault conditions. |
| |
| It flashes during a | ||
| 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
(color unspecified)
This LED indicates command activity by the drive. 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.
