Re: [issue1560] Unable to modify partition table on ThinkPad T61
Thomas Nikolajsen (via DragonFly issue tracker) wrote:
> Thomas Nikolajsen <thomas.nikolajsen@mail.dk> added the comment:
>
> It seems like you don't have a recognized MBR on 'ad0'.
Believe me: I have - dozen times. Rebooting between assuming the kernel
caches the current (empty) MBR, powering off the machine - and as I told,
using as well Linux and Windows XP to create a partition including a
filesystem on the disk: DragonFly see always the attached MBR - regardless
what I've done before.
> Installing an initial MBR can be done by:
> fdisk -BI ad0
Tried - because it's described in /README
> Updating the MBR can be done by:
> fdisk -u ad0
As in FreeBSD since ages (I'm FreeBSD user since 2000 or so ...)
> If you would like to have multiple OSs installed,
> a boot manager can be installed in MBR by:
> disklabel -B ad0
>
> How did you try to modify MBR; using installer or manually?
Both.
> If manually; which commands did you use?
> (e.g.
> dd if=/dev/zero of=/dev/ad0 bs=512 count=32
I used "dd if=/dev/zero of=/dev/ad0 bs=32k count=16 (later I tried count=640)
> fdisk -BI ad0
> dd if=/dev/zero of=/dev/ad0s1 bs=512 count=32
> disklabel -w -B ad0s1 auto
> disklabel -e ad0s1
> as example in disklabel man page)
>
> Are you sure the HD you would like to modify is 'ad0'?
> 'da0' is first AHCI / SCSI attached disk,
da0 is the "internal" windows disk (seen by both NTFS partitions on it).
> 'da8' is first external disk (e.g. USB attached),
USB stick I used to copy the logs.
> 'ad0' is first ATA / SATA, non-AHCI attached disk.
The empty disk I want to use to put DragonFly BSD on it.
> Your logs show several disks, ad0, ad8 & da0, in system:
I couldn't see anything in the dmesg log, but I thought a developer might do ...
Jens
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