# Changing the SCSI-transfer speed

Notes:
  1. This action is supported in bootable-CD mode only.
  2. This action is not supported on the integrated RAID controller.
  3. This action is not supported on the ServeRAID-8i controller and ServeRAID-7t controller.

Use this action to change the SCSI-transfer speed.

1. In the Physical devices view, click the SCSI channel identifier:
2. Right-click Change the SCSI transfer speed a transfer speed.
   The following choices are available:
   - Optimal

   This value is available if your controller supports it; otherwise, Optimal does not appear in the menu. Optimal is the default value. When the transfer speed is set to Optimal, the ServeRAID controller determines the best transfer speed, based on the types of SCSI drives and enclosures in use.

   - Ultra320 SCSI
   - Ultra160 SCSI
   - Ultra2 SCSI
   - UltraSCSI
   - Fast SCSI-2
   - SCSI-2
   - SCSI-1

   This value is available if your controller is set to SCSI-1; otherwise, SCSI-1 does not appear in the menu.

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