Imminent hard drive failure 2010 iMac 27, 2.93GHz

Hi I have a 2010 2.93GHz 27in iMac that is my main machine. It has both a 256GB Apple SSD and a 2TB Hitachi HDS722020ALA330 installed with the SSD running Apps and the system and the Hitachi used for my Home folder.
I use both iStat and SMART Utility to monitor the condition of both drives since a sudden failure by either would be catastrophic. I have an adequate back-up procedure in place but I don't want to be suddenly pressurised to replace either drive hurriedly in an emergency. Call it being prepared...
Anyhow, SMART Utility is warning me of imminent failure of the Hitachi drive containing all my data. However iStat passes both using SMART status. So which do I believe?
Looking online it seems that SMART Utility has a pretty good track record in detecting possible failures but I guess unlesss you actually wait for it to happen you can never be sure if the diagnosis is correct.
So I decided to prepare for the worst by ordering a Western Digital 4TB Caviar Black. I like WD and I like the five year warranty even more, however when it arrived I tried to format it. It was noisy spinning up and Disk Utility would not allow a format to take place even though it did actually see it in the list of drives.
I have since found out that internal drives on some iMacs must be replaced with those from identical brands - in my case Hitachi. Hitachi is now called HGST and guess who owns it - yup, Western Digital...
So, the supposed reason for needing an identical branded hard drive is to enable the temperature sensors to work avoiding the 'full-on fan experience'. In the past I have fitted other brand hard drives to other iMacs and used HDD Fan Control to get around the issue but this is my own machine and I intend hanging on to it in as close to factory condition as I can. It's simply the best Mac I have owned in 20 years!
HDD Fan Control has worked very well but obviously I don't want to go down the road of stripping my main machine unneccessarily nor encountering compatibility or other problematic issues that further delay fixing the drive keeping my machine unavailable for work.
And there's the rub. It isn't yet a problem according to iStat. So which software should I believe and which 4TB hard drive should I buy to maintain an otherwise happy Apple experience with my beloved 2010 iMac?
Thanks for any helpful advice!
Rich

Run Apple Hardware Test in extended mode 2-3 times back to back. If any errors appear then take the machine in immediately and get the machine fixed. If errors appear that only confirms a hardware  problem is imminent however if  no errors appear you may still have troubles.
You left your profile completely blank, it would be helpful if you read Help us to help you on these forums so you know what we look for to assist you.
I would also recommend running Repair Disk in Disk Utility on the internal HD,  because you did not complete a profile we don't even know the version of OS X you have running so we cannot offer more instruction than that. If Repair Disk reports errors then yes take it in immediately for replacement.

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    ****Please mark Accept As Solution if it solves your problem****
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    ****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
    2015 Microsoft MVP - Windows Experience Consumer

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    2015 Microsoft MVP - Windows Experience Consumer

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    ****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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    Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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