From owner-freebsd-questions@FreeBSD.ORG  Fri May 25 03:42:12 2007
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Date: Fri, 25 May 2007 13:42:01 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org>
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Cc: freebsd-questions@freebsd.org
Subject: Extended partition
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On Wed, 23 May 2007 17:30:29 +0330 Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org> wrote:
 > Dear all,
 > I have 1 freebsd partiotion & 4 other partitions:
 > 1.Etended DOS (Primary)
 > 2.ext3 logical under 1
 > 3.ext3 logical under 1
 > 4.solaris swap (primary)
 > When i mount ext3 partitions, i receive "invalid argument"
 > mount_ext2fs -o ro /dev/ad0s6 /media/mymountpoint
 > I have checked ad0s6 exist.
 > Please help me.....

The first slice in your 'extended partition' should be ad0s5.

On top of your text description, please provide the output of:

# fdisk ad0

# ls /dev/ad0*

Cheers, Ian