[CentOS] WD RE4-GP Dropped From Raid

Hi All,

I have a WD RE4-GP which dropped an Adaptec 51645 RAID controller. I ran a 
smartctl short test on the drive and it failed with a read error. So I ran 
the Western Digital's own diagnostic software (DLGDIAG), both the short 
and extended test on the drive and it passed with no errors. So I ran the 
smartctl short test again and again it failed. I then ran smartctl long 
test and that also failed at the same logical block address as the short 
test. Can anyone shed any light on this? Can I RMA the drive even if it 
passes Western Digital's own tests? Thanks in advance for any advice.

Cheers,

Steve