Hmm, I am not quite sure why you think Spinrite will help determine if the HD is still OK or not, unless you think it has bad blocks? I have had a HD fail after 1 week, after running that program on it, and it passed all the tests.
About all it can do is tell you the HD is ok during the test process, anything after that, and it still can fail at any time.
My rule of thumb is, if you think the drive is bad, then get a new one, and use that one for unimportant info that you can wipe at any time.