If it’s clicking, that site shows a firmware upgrade.
and
“IBM, when notified about this occurance, may replace the drive with a Fujitsu 5k 80GB hard drive, as to them the sound is indicative of a potential hard drive failure.”
Take two measurements at one hour interval. If you have not turned off drives power management, you should get difference of ~50 counts. That would give 12000 hours ( 500 days 24/7 ) of operation until you reach 600000. For my usage ( less than 2000 hours/year ) drive will last at least 6 years without any extra measures.
It’s just 21621,my Load_Cycle_Count is more than 180000.I think it’s not necessary to worry about this.You can manage the situation a little better,follow the openSUSE HowTo: Disk Power Management - openSUSE