i tested for badblocks on my swap partition
i got three of them
but hen i tested that partiton after formatting it on windows and surface scan also did not gave any error
again i made it my swap partition and again running badblocks gave the same blocks
pl. tell me what to do

Window's surface scan checks for the file system integrity on the file system it has built, Linux was actually polling the hardware to see what had come unstuck. Honestly, if the drive is within warranty: replace it. If its not, start making backups, you can run with a drive with badblocks for a while, but when the drive's internal BIOS is incapable of keeping the drive geometry intact one day, everything just unzips into a mess.

Cheers,

Finegan

if it's western digital, ibm, or maxtor, download
the low level formatter for the drive. depending on the
brand, you may have to lose everything to attempt to
fix the drive.

do we have a formatter in linux to format hard drive,mine is seagate

all those programs i was talking about were dos based.
i haven't seen one for seagate.

this low level format will erase the whole disk
what to do for only a partition

it just because of the formatter that comes with the brand. I
didn't know seagate even had one. drives have extra good
sectors in them, and the low level formatter marks sectors bad,
and uses good ones in their place, if it can. some brands low
level formatter's will just remap sectors and leave the rest of the
disk alone. other ones have to do the whole disk. you can't just
do a partition.
you could also just figure out where in the drive the bad sectors
are. there's probably just a few. i can't remember the output
of mkswap -c , but you could mke2fs -b /dev/hdxx, and remember
where the bad sectors are, then re partition the swap so it
doesn't include that area.