ruined partition. Can data be recovered?

My system is AMD 1600 XP with 512 megs ram, a 200 gig ide hard drive, an Aopen dvd/cd/rw and a D-link router/adsl modem.

I have been having troubles with my hard drive or cables or motherboard.
The problems with my hard drive were I was getting dma errors and often the drive could not be found by the bios.I replaced the 80 wire cable 6 times with no reliable results. I have now installed a 40 wire cable and it seems more reliable.

In trying to fix my problem I have somehow made a partition unreadable.

It is a spare partition that I was saving data to. I have only partially saved one dvd of data but the drive had 18 gigs and I would really like to restore it or maybe get the data back.

I have run e2fsck /dev/hda20 and the result is this:

root@okv:/home/leo# e2fsck /dev/hda20
e2fsck 1.38-WIP (09-May-2005)
A20: Attempt to read block from filesystem resulted in short read while reading block 520

A20: Attempt to read block from filesystem resulted in short read reading journal superblock

e2fsck: Attempt to read block from filesystem resulted in short read while checking ext3 journal for A20

I then ran: dmesg | tail and the next is what I got;

leo@okv:~$ dmesg | tail
hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=321396457, high=19, low=2629353, sector=321396456
ide: failed opcode was: unknown
end_request: I/O error, dev hda, sector 321396456
Buffer I/O error on device hda, logical block 40174557
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=356566902, high=21, low=4245366, sector=356566898
ide: failed opcode was: unknown
end_request: I/O error, dev hda, sector 356566898
JBD: IO error reading journal superblock
EXT3-fs: error loading journal.
leo@okv:~$

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Leo in Canada:
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