Can'not mount "sysid 15 (0x0f),(Extended DOS (LBA))" at da0s2

Hello friends,

I was create a new "FAT32" partition with Acronis Disk Director[1] at
the same place
where in the past I have a UFS partition.
Now when I try to mount this new partiton I get this error:

# mount /dev/da0s2 /mnt/usb1
mount: /dev/da0s2 : Invalid argument

# mount -t msdosfs /dev/da0s2 /mnt/usb2
mount_msdosfs: /dev/da0s2: Invalid argument

I wonder that the "strange thing" is the sysid 15 for this partition,
no the sysid 12 found in another usb disk that I have here.

Could you help me with this trouble?

Thanks so much,
Vinnix


[1]: http://www.acronis.com/homecomputing/products/diskdirector/

[2]:
# fdisk da0
******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=9729 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=9729 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 41929587 (20473 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 254/ sector 63
The data for partition 2 is:
sysid 15 (0x0f),(Extended DOS (LBA))
    start 41929650, size 114366735 (55843 Meg), flag 0
        beg: cyl 1023/ head 0/ sector 1;
        end: cyl 1023/ head 254/ sector 63
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

[3]:
# file -s /dev/da*
/dev/da0:    x86 boot sector; partition 1: ID=0xa5, active, starthead
1, startsector 63, 41929587 sectors; partition 2: ID=0xf, starthead 0,
startsector 41929650, 114366735 sectors, code offset 0x31

/dev/da0s1:  Unix Fast File system [v2] (little-endian) last mounted
on /u02, last written at Wed Jul  1 19:12:35 2009, clean flag 1,
readonly flag 0, number of blocks 10482396, number of data blocks
10150835, number of cylinder groups 112, block size 16384, fragment
size 2048, average file size 16384, average number of files in dir 64,
pending blocks to free 0, pending inodes to free 0, system-wide uuid
0, minimum percentage of free blocks 8, TIME optimization

/dev/da0s1a: Unix Fast File system [v2] (little-endian) last mounted
on /, last written at Tue Jul 28 13:06:51 2009, clean flag 1, readonly
flag 0, number of blocks 10482392, number of data blocks 10150831,
number of cylinder groups 112, block size 16384, fragment size 2048,
average file size 16384, average number of files in dir 64, pending
blocks to free 0, pending inodes to free 0, system-wide uuid 0,
minimum percentage of free blocks 8, TIME optimization

/dev/da0s2:  x86 boot sector; partition 1: ID=0xb, starthead 1,
startsector 63, 114366672 sectors, extended partition table
(last)\011, code offset 0x0, BSD disklabel

[4]:
# uname -a
FreeBSD vinnix.corp.triarius.com.br 8.0-BETA2 FreeBSD 8.0-BETA2 #9:
Tue Jul 21 21:28:19 BRT 2009
root_at_vinnix.corp.triarius.com.br:/usr/obj/usr/src/sys/VINNIX  amd64