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# Can't Choose Second Operating System on Olivetti M6 Computer

Article ID: 110889

Article Last Modified on 10/31/2006

APPLIES TO

- Microsoft Windows NT Advanced Server 3.1

This article was previously published under Q110889

## SYMPTOMS

You cannot successfully load the secondary operating system (MS-DOS) from Boot Loader on an Olivetti M6 series computer if you are booting from a SCSI hard disk drive connected to an Adaptec 154X controller. The following error message appears:
Non-system disk or disk error.
If you boot from the onboard IDE controller or any other hardware configuration, this problem does not occur.

## CAUSE

This problem is caused by the specific interaction between the Olivetti M6 series computer and the Adaptec 154X controller.

## WORKAROUND

You can use a bootable floppy disk to avoid using Boot Loader in one of the following two ways:

1. Boot from a bootable MS-DOS disk when you want to use MS-DOS.
2. Boot from a bootable MS-DOS disk. Use the SYS command to change the boot sector from the Windows NT Boot Loader to MS-DOS. When you want to return to Windows NT, boot with the Windows NT setup disk. Choose R for repair. After you insert the Emergency Repair disk, choose only to verify boot files on drive C.

## STATUS

Microsoft has confirmed this to be a problem in Windows NT Advanced Server version 3.1. This problem has been corrected in Windows NT Server version 3.5.

Additional query words: prodnt

Keywords: kb3rdparty kbhardware KB110889