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Date:      Thu, 6 Feb 1997 17:16:25 +1100
From:      Bruce Evans <bde@zeta.org.au>
To:        durham@w2xo.pgh.pa.us, hackers@freebsd.org
Subject:   Re: DOS partition trouble
Message-ID:  <199702060616.RAA09563@godzilla.zeta.org.au>

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>Twice now, I have removed a DOS partition
>from a disk with both DOS and FreeBSD
>partitions and been unable to boot FreeBSD.
>...
>I had tried running the partition editor when I had no DOS
>partition and it gave all indications of sucessfully writing
>out the boot block, but would not boot until I remade the
>DOS partition. Trying to mount the root directory from the MFS
>on the boot floppy gave a "bad super block" error.

For SCSI disks with at least ncr controllers, this could be caused
a DOS partition that ends on a cylinder boundary and FreeBSD partition
that doesn't.  When you remove the DOS partition, the controller's BIOS
will have problems determining the disk geometry.

Bruce



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