I just did a Google search on the two failure notes and this is something that I found and might help:http://www.techsupportforum.com/forums/f16/dst-short-status-test-failed-202137.html
Thanks for your reply, but this isn't relevant to the issue i'm facing.
My HDD doesn't fail short DST. Neither does it fail extended DST.
the two errors i get are:-
1> Reallocated sectors count :- 1 [RAW]
2> Reallocation event count :- 1 [RAW]
I've ran both the short DST and the extended DST (using HDDSentinel), the drive passes both these tests.
But on the summary page, i always get these two errors. And then it says estimated life remaining is more than 1000 days, and disk health is "Excellent (98%)", performance is "Excellent (100%)" ..
Up until yesterday, disk health showed 100%. It's now degraded by 2 percentage points.