Problem with HDD

During I was watching something on youtube, i heard some click from HDD and after that couldnt access E, F and G partition. I restarted computer several times, boot was slower than usually, but still couldnt access these partitions until I shut down and turned on computer. Then everything was normal, all data on hard drive.

WD Data Lifeguard
Test Option: QUICK TEST

Model Number: WDC WD1600AAJS-00B4A0

Unit Serial Number: WD-[Deleted]

Firmware Number: 01.03A01

Capacity: 160.04 GB SMART

Status: PASS

Test Result: FAIL

Test Error Code: 06-Quick Test on drive 1 did not complete! Status code = 07 (Failed read test element), Failure Checkpoint = 97 (Unknown Test) SMART self-test did not complete on drive 1!

Test Time: 16:31:10, May 05, 2012

Test Option: EXTENDED TEST

Model Number: WDC WD1600AAJS-00B4A0

 Unit Serial Number: WD-[Deleted]

Firmware Number: 01.03A01

Capacity: 160.04 GB

SMART Status: PASS

Test Result: FAIL

Test Error Code: 08-Error was detected while repairing bad sectors. Test Time: 17:01:29, May 05, 2012

What should I do now? Is this HDD reliable or should I buy another one?

Is my opinion that you need to backup your computer and replace your drive…