having trouble mounting disk image on loopback device

Here is the output I'm getting when trying to mount a disk image
created by dd that has been assosciate with /dev/loop0

root@ubuntu:~# losetup -d /dev/loop0
root@ubuntu:~# losetup /dev/loop0 ./hdd.dd
root@ubuntu:~# fdisk -l /dev/loop0

Disk /dev/loop0: 4303 MB, 4303290368 bytes
255 heads, 63 sectors/track, 523 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/loop0p1 1 280 2249068+ 83 Linux
/dev/loop0p2 281 523 1951897+ b W95 FAT32
root@ubuntu:~# mount -r -t ext3 /dev/loop1 /mnt/ext3
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
missing codepage or other error
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)
In some cases useful info is found in syslog - try
dmesg | tail or so

I have another image created with dd that I got off a DVD that came
with the book I'm going through and I get the same problem with it.
I'm at a loss as to why this is happening.

.

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