Disk Utility strange behavior

I have 3 drives on my Mac Pro
“HD 2” is declared SMART “failing” with Disk Utility.
It is “VERIFIED” and passed using TechTool Pro 5.
After this I went ahead and rebuilt volume structure with TechTool and did a complete surface scan, both were successfully completed. No bad blocks.
I went again to Disk Utility and again same “failing” messege. All other 2 drives SMART “verified”.
My question Is:
Is my hard drive “HD 2” failing or is it not failing ? If indeed It is not failing why is Disk Utility giving me a diferent messege then Tech Tool ??
How can I fix this ?
Message was edited by: bandu2

Can the drive send Disk Utility one message and a different one to tech tool ??
No. The drive merely provides information to the software that interrogates the SMART data provided by the drive. The software in turn can then choose to report that information however it wishes even if the software reports it incorrectly. But the drive is simply the messenger.
There are potentially lots of differences in how manufacturers design the SMART information reported by their drives. Some report all the SMART data while others select a subset of the information. This is usually determined by how much they will price the drive. Less expensive models usually have less SMART data reported (or none at all.) It's also up to the manufacturers to provide the statistical information that helps determine when a drive is supposedly failing. SMART software then interrogates this information directly from the drive's firmware and then reports something to the user. DU merely reports if the drive is "Verified" or "Failing." Other software may give more extensive reports. However, unless you actually know what the data means then it's pretty useless information. Most of us wouldn't have a clue as to how to interpret the SMART data reported by a drive. And drive manufacturers have no interest in telling us about how SMART is implemented on their products. Consequently most SMART software knows how to interrogate the drive and how to report the data, but not tell you what that data means.

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