Partition not recognized by mount

[julius Junghans]

Hi,

somehow after a power failure i can't mount my ext3 partition :(

mount /dev/hdd2 /mnt/gentoo/
mount: you must specify the filesystem type

fdisk /dev/hdd

The number of cylinders for this disk is set to 484521.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/hdd: 250.0 GB, 250059350016 bytes
16 heads, 63 sectors/track, 484521 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdd1               1         970      488848+  83  Linux
/dev/hdd2             971      155114    77688576   83  Linux


mount -t ext3 /dev/hdd2 /mnt/gentoo/
mount: wrong fs type, bad option, bad superblock on /dev/hdd2,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


dmesg:
VFS: Can't find ext3 filesystem on dev hdd2.
VFS: Can't find ext3 filesystem on dev hdd2.


What can i do to get my data back?

Julius