Chosen Solution
I read at AppleToolbox that Users of mid-2010 MacBook Pros continue to experience frequent stalls/hangs . . . The problem appears to be hard drive-related, and occurs most frequently with the standard 320 GB 5400 RPM drive, but is also occurring with the 5400 500GB and 7200 500GB drives. I assume this applies to the optional Apple-supplied drives but has anyone experienced this with a drive from a third party that they replaced themselves?
The answer to your question lies right in the link you provided. The hangs seem to occur randomly and with different drives. So I would do what the other users have done and contact Apple and have the machine replaced and help Apple engineers resolve this issue.
