https://community.hpe.com/t5/disk/multiple-scsi-controller-boot-order-problem/m-p/3514970#M5419 I do not know the workstation in question, but may give some suggestions:<BR />-in the bios of the Workstation check if you have a "boot device"option, (different than the boot priority) several chipset have this option, you can chose between added controller or integrated one.<BR />-Check in the documentation the priority of each slots, you may have inserted the array controller on a slot with higher priority then the internal controller, changing slot will change priority.<BR />-try to perform a clear cmos, some time, old informations can prevent the machine to boot from some devices<BR /><BR />marino<BR /> Sun, 03 Apr 2005 17:34:34 GMT Marino Meloni_1 2005-04-03T17:34:34Z https://community.hpe.com/t5/disk/multiple-scsi-controller-boot-order-problem/m-p/3514969#M5418 I've got a Compaq W8000 Workstation running Windows 2000 Server. The built in SCSI controller is the boot partition. I've added a Compaq Smart Array 221 SCSI RAID Controller into a PCI slot. I had everything working fine until a reboot. Now everytime I try to boot it defaults to the RAID controller and gives me the non-system disk error. I've gone through the RBSU but it doesn't seem to provide me any useful options.<BR /><BR />If this were a normal controller I would expect I could simply disable the BIOS, but if there is a way to do so I haven't discovered it yet.<BR /><BR />I need to boot off the built-in SCSI controller. How? <BR /><BR />Also, this isn't the first time this has happened. Why does the system suddenly decide to change the boot order? Thu, 31 Mar 2005 00:52:25 GMT https://community.hpe.com/t5/disk/multiple-scsi-controller-boot-order-problem/m-p/3514969#M5418 toscrawford 2005-03-31T00:52:25Z https://community.hpe.com/t5/disk/multiple-scsi-controller-boot-order-problem/m-p/3514970#M5419 I do not know the workstation in question, but may give some suggestions:<BR />-in the bios of the Workstation check if you have a "boot device"option, (different than the boot priority) several chipset have this option, you can chose between added controller or integrated one.<BR />-Check in the documentation the priority of each slots, you may have inserted the array controller on a slot with higher priority then the internal controller, changing slot will change priority.<BR />-try to perform a clear cmos, some time, old informations can prevent the machine to boot from some devices<BR /><BR />marino<BR /> Sun, 03 Apr 2005 17:34:34 GMT https://community.hpe.com/t5/disk/multiple-scsi-controller-boot-order-problem/m-p/3514970#M5419 Marino Meloni_1 2005-04-03T17:34:34Z