On 02/21/2013 10:30 AM, stone@heisl.org wrote:

dd if=/dev/zero bs=4096 count=1 seek=1073006628 of=/dev/sdc1
dd: `/dev/sdc1': cannot seek: Invalid argument
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0,000493485 s, 0,0 kB/s

is there a problem with the bs parameter?
shoud i try dd if=/dev/zero bs=512 count=8 seek=1073006628 of=/dev/sdc1
?

How did you get 1073006628?  That is around the 4T mark?

Please show the badblocks output file.

Phil