Acer AcerAltos 19000 User Manual page 160

Use the Setup program to map the second standard hard disk (if one exists)
out of the configuration.
Be sure that the SCSI drive to be used as drive D is set to SCSI ID 0. Check the
drive manual for information on setting the SCSI ID for that device. You can
also use the SCSISelect utility to determine the SCSI addresses of peripherals
on the SCSI bus.
Be sure that SCSI parity checking is consistently enabled or disabled on all
devices on the SCSI bus.
Verify that the SCSI controller and the SCSI devices are properly configured
and installed.
Be sure to cycle the power OFF and ON after changing any values on a SCSI
controller, in a Setup program, or on a SCSI device. Doing this ensures that
the new initial values are loaded.
Be sure that the SCSI bus is properly terminated.
Be sure that the disk is formatted and has a partition.
Check cable connections and pin-1 orientation.
Make sure your computer's CMOS Setup is set to No Drives Installed, as is
required for SCSI host controllers.
Be sure that the SCSI drive to be used as drive C is set to SCSI ID 0. Check the
disk drive manual for information on setting the SCSI ID for that device. You
can also use the SCSISelect utility to determine the SCSI addresses of
peripherals on the SCSI bus.
Set the SCSI drive to be used as drive D to SCSI ID 1. Check the drive manual
for information on setting the SCSI ID for that device.