We got this HDD back in August 2011.
I ran a Parkdale program this evening and this the HDD Write/Read result:
And from Western Digital's own diagnostic tool which shows a FAIL on SMART status:
In contrast, HDD Write/Read from a few years ago:
SSD Write/Read this evening:
I bought a replacement HDD today, a Western Digital WD Blue 1TB WD10EZEX. It should be with me by tomorrow.