Well, after i trying to find proper sensor, i think, i have done it.
This script:

##########################
Digit=0
while [ "$Digit" -le 300 ]
do
  echo \"WDC WD5000AAKX-60U6AA0\" $Digit C \"Western Digital Caviar Blue 500GB 16MB\" > /etc/hddtemp.db ;
  echo "$Digit" >> /home/lviv/HDDtemp ;
  echo `hddtemp /dev/sda` >> /home/lviv/HDDtemp ;
  let "Digit+=1"
done
##########################

told me, that proper sensor placed at 190, so i added line:

"WDC WD5000AAKX-60U6AA0" 190 C "Western Digital Caviar Blue 500GB 16MB"

to /etc/hddtemp.db

so now it work properly:

/dev/sda: WDC WD5000AAKX-60U6AA0: 22°C