[Help] pb w/ dd and disk read errors

[gnu]

Hi all, 

Sorry if this is definetly off-topic, but after hours I couldn't find 
anything to solve my pb. Maybe you can help.
I have a 35G partition with badblocks. Unfortunetly, badblocks starts at the 
first sector of the partition which implies the superblock is corrupt. And 
my disk is just noisy (doin krr... krrr.. krrR..)
Anyway, with dumpe2fs, by specifying a superblock backup, I have the all 273 
Groups from the partition. Example : the last one is : 

Group 273: (Blocks 8945664-8960244)
Block bitmap at 8945664 (+0), Inode bitmap at 8945665 (+1)
Inode table at 8945670-8946180 (+6)
0 free blocks, 16111 free inodes, 13 directories
Free blocks: 8945666-8945669, 8946492-8960244
Free inodes: 4464338-4480448 

Okay... because the drive fails I can't run fsck on it because the disk 
can't write at the beginning of the partition anymore which means that I 
can't recover my data!! (And I have no backups ;-) 

Then, I tried to make a bit2bit copy of the partition with dd : 

dd if=/dev/hdd10 of=deadfs bs=512 conv=noerror 

NB : I am using conv=noerror because i want to force dd to continue even in 
case of I/O error like this one : 

hdd: dma_intr: error=0x40 { UncorrectableError }, LBAsect=48420021, 
sector=48
end_request: I/O error, dev 16:4a (hdd), sector 48 


but it doesn't work! the file produced with the dd command has not the same 
count of blocks than the partition (missing 4 blocks)
When I run dumpe2fs on it it prints me the right first Group but after I 
only have garbage (but I should have the same result than with hdd10!!) 

What am I doing wrong??? I've dried dd with various block sizes without any 
success 

dumpe2fs -ob32768 -oB4096 /dev/hdd10 :
works 

dumpe2fs -ob32768 -oB4096 ./deadfs :
give me only the first group and garbage for the other ones. 

Any help GREATLY appreciated!!
Sorry for this off-topic message 

Cheers, 

a2k