wd500 aaks

I recieved this error message:     error code BIOHD-8

Can anybody tell me what this means?

Some research suggests that a BIOHD-8 error indicates a SMART failure.
Run Data LifeGuard and some additional comprehensive SMART diagnostics.

Downloads for WD Caviar Blue / SE / SE16 (SATA II):
http://support.wdc.com/product/download.asp?modelno=wd5000aaks&x=0&y=0

HD Sentinel (DOS / Windows / Linux):
http://www.hdsentinel.com/

HDDScan for Windows:
http://hddscan.com/

HD Tune:
http://www.hdtune.com/download.html