move ext3 partition stops due to read error

When I move a ext3 partition (the rootpartition) gparted comes with a read error after about 2 min. I boot from the live-cd.
What can be wrong?
This is the listing:
GParted 0.3.7

Libparted 1.7.1

Move /dev/sda2 to the right  00:04:05    ( ERROR ) 
     calibrate /dev/sda2  00:00:00    ( SUCCESS ) 
     path: /dev/sda2
start: 4209030
end: 42170624
size: 37961595 (18.10 GiB) 

calculate new size and position of /dev/sda2  00:00:04    ( SUCCESS ) 
     requested start: 8418060
requested end: 46379654
requested size: 37961595 (18.10 GiB) 
new start: 8418060
new end: 46379654
new size: 37961595 (18.10 GiB) 

check filesystem on /dev/sda2 for errors and (if possible) fix them  00:01:11    ( SUCCESS ) 
     e2fsck -f -y -v /dev/sda2 
     Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

196653 inodes used (8.26%)
1392 non-contiguous inodes (0.7%)
# of inodes with ind/dind/tind blocks: 10169/90/0
1238800 blocks used (26.11%)
0 bad blocks
1 large file

161086 regular files
20650 directories
45 character device files
48 block device files
4 fifos
6809 links
13800 symbolic links (12944 fast symbolic links)
1011 sockets
--------
203453 files

e2fsck 1.40.8 (13-Mar-2008)

move filesystem to the right  00:02:50    ( ERROR ) 
     perform readonly test  00:02:50    ( ERROR ) 
     using internal algorithm 
read 37961595 sectors 
finding optimal blocksize 
     read 32768 sectors using a blocksize of 128 sectors  00:00:01    ( SUCCESS ) 
     32768 of 32768 read 
0.64305 seconds 

read 32768 sectors using a blocksize of 256 sectors  00:00:01    ( SUCCESS ) 
     32768 of 32768 read 
0.542866 seconds 

read 32768 sectors using a blocksize of 512 sectors  00:00:00    ( SUCCESS ) 
     32768 of 32768 read 
0.515939 seconds 

read 32768 sectors using a blocksize of 1024 sectors  00:00:00    ( SUCCESS ) 
     32768 of 32768 read 
0.333041 seconds 

read 32768 sectors using a blocksize of 2048 sectors  00:00:01    ( SUCCESS ) 
     32768 of 32768 read 
0.309303 seconds 

read 32768 sectors using a blocksize of 4096 sectors  00:00:00    ( SUCCESS ) 
     32768 of 32768 read 
0.323206 seconds 

optimal blocksize is 2048 sectors (1.00 MiB) 

read 37764987 sectors using a blocksize of 2048 sectors  00:02:47    ( ERROR ) 
     14555003 of 37764987 read 
Error while reading block at sector 27416966 

14751611 sectors read 

libparted messages    ( INFO ) 
     Input/output error during read on /dev/sda