It isn't only the vendors of the hard disks that can interpret and implement whatever they want, it is also every other part of the system such as Mainboards. I suggest you read the Wikipedia article especially the part "Lack of common interpretation" and with statements like:
Quote:
From a legal perspective, the term "S.M.A.R.T." refers only to a signaling method between internal disk drive electromechanical sensors and the host computer. Hence, a drive may be claimed by its manufacturers to implement S.M.A.R.T. even if it does not include, say, a temperature sensor, which the customer might reasonably expect to be present. Moreover, in the most extreme case, a disk manufacturer could, in theory, produce a drive which includes a sensor for just one physical attribute, and then legally advertise the product as "S.M.A.R.T. compatible"
If you are looking for any resemblance of standardisation, then I don't think you are going to have much success.
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