Originally Posted by birdstrike
What are the odds that this was a one-off problem, or should I think of trashing the drive?
A SMART alert verified by the manufacturer's diagnostic software is plenty to get your drive replaced under warranty, assuming it still is covered. The warranty was probably 1 or 3 years, perhaps 2 (retail drive) or 5 (recent Seagate).
I wouldn't use the drive, except perhaps as a scratch disk or similar.
PS. SMART alerts point to something worse than the only thing a low-level format would 'fix', bad sectors.