First, my apologies for trampling on another individual's drive test instructions.
I installed the GSmartControl package as instructed and ran the short self test which produced no errors/logs, and then ran the extended self test. That test said it would take 2 hours to complete, but it was finished in a few minutes after 10%, with a "completed with read failure" result. The error logs still say there is nothing wrong with it.
As a comparison I ran the same test on the Toshiba I'm typing from, which is older and has original hard drive and there are no errors on either the short or extended test. So does the GSmart test mean indeed the Seagate in the HP is indeed failing?