download this
http://hddlife.com/
it has a trial period ... you only need a couple of days.
you are looking for SMART diagnostics report
when you go back take the result with you or tell them this is obviously a SMART 1720 failure report (make is sound as if you are confident) - tell them to look on the net ....
what they really want is for you to wait 'till the drive fails (which i almost certainly will)
failing that the manufacturer of your HDD will also have a tool in the support section of their site