fdisk/disklabel - Error: unable to write data to disk ad0

From: Herbert (herbert_at_bugat.at)
Date: 05/31/03

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    Date: Sat, 31 May 2003 19:05:56 +0200
To: freebsd-questions@FreeBSD.org

    Hei!

    On Thursday May 29th I installed FreeBSD 5.1 Beta2. The next day I've
    update to CURRENT from May 30th. I have a 60 GB ATA harddisk and during
    installation I created only 1 20 GB slice for FreeBSD. Today I wanted
    to use the other 40 GB of my hard disk and create two more slices each
    20 GB. Well, fdisk reports that the disk geometry is wrong and sets it
    to 7476/255/63, the same disk geometry the BIOS reports. When I try to
    save the changes in fdisk, I get the following error messages:

          Error: Unable to write data to disk ad0
          Disk partition write returned an error status!

    Hmm, I tried both in multiuser and singleuser mode.
    Finally I booted with the floppies I had used to setup FreeBSD 5.1B2.
    Fdisk also reports that the disk geometry is wrong and sets it to
    7476/255/63. But creating the slices and saving the changes did work:

    The data for partition 1 is:
    sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    ----[snip]----
    The data for partition 2 is:
    sysid 165 (0xa5),(FreeBSD/NetBSD/386BS
    ----[snip]----
    The data for partition 3 is:
    sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    ----[snip]----
    The data for partition 4 is:
    <UNUSED>

    Now I have booted FreeBSD from hard disk and try to create partitions
    within the new slices. But again I get:

        Error: unable to write data to disk ad0

    Now I am booting with the install floppies again. I guess this is
    working fine.
    Any ideas what I am doing wrong?

    Regards,
    Herbert
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