Why drive fails to spin up correctly?
Check for a jumper in the auto-start position. When you install a jumper on the auto-start pins, the hard drive motor starts when the computer is turned on. When the auto-start position is open the drive must receive a start command from the SCSI adapter before is can spin up. Some computers expect the drive to be spinning and do not wait for a command from the SCSI adapter. Also, you might have to select additional setting on your SCSI adapter. If you need more information, see the documentation that comes with your operating system and SCSI adapter.