From owner-freebsd-questions@FreeBSD.ORG  Mon Apr 26 05:32:19 2004
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Date: Mon, 26 Apr 2004 20:30:00 +0800
From: Robert Storey <y2kbug@ms25.hinet.net>
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Subject: Re: Auto-mounting ext2 slices
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I am not having good luck doing an fsck on /dev/ad0s6 (which is indeed a Linux
ext2 partition). Here's what happens (note that partition is unmounted):

  root@sonic:~> e2fsck /dev/ad0s6
  e2fsck 1.32 (09-Nov-2002)
  The filesystem size (according to the superblock) is 1343427 blocks
  The physical size of the device is 0 blocks
  Either the superblock or the partition table is likely to be corrupt!
  Abort<y>? yes

  root@sonic:~> fsck_ext2fs /dev/ad0s6
  ** /dev/ad0s6
  BAD SUPER BLOCK: MAGIC NUMBER WRONG
  ioctl (GCINFO): Inappropriate ioctl for device
  /dev/ad0s6: can't read disk label

This partition is not dirty, and I can mount and unmount it if I want to:

  root@sonic:~> mount_ext2fs /dev/ad0s6 /shared
  root@sonic:~> ls -d b*
  bison-1.35              bison-1.35.tar.gz       book.txt
  root@sonic:~> cd
  root@sonic:~> umount /shared
  root@sonic:~> cd /shared
  root@sonic:/shared> ls
  root@sonic:/shared> 

But how can I fsck it? I must be doing something wrong.

best regards,
Robert