Yes, it is model specific and all this chat about different results is good, but I could have filled in some of the blanks long ago.
First, try using gsmartcontrol, it's a guified way of using smartctl and it rocks, giving extensive feedback on attributes when you hover your mouse over each line.
Older drives will have less fields supported, newer drives will likely have more, but not all drives will report every field absolutely correctly.
Example, the way smartctl interprets a value from the manufacturers tables for a specific field may simply be incorrect for that drive make, model and version. Example, I had a drive that showed a power on time that would place it's manufacture in the mid 1900's, which we all know is not possible and my laptops HDD, which is 6 months old is showing 65535 start/stop counts, as it has from the day I installed it.
Simply put, smartctl will give a good general impression, though not always 100% accurate in every field because not all manufacturers follow an exact prescribed pattern for how their drives record data in each field and they have been known to add their own tweaks which can only be interpreted by their own proprietary toolset.
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Regd Linux User #472293
(Mine)Lenovo T550, i7-5600U, 16GB, 128GB SSD + 1.0TB HDD, MX15 64-bit
(Wifes) Asus M4A88TD-M, AMD Phenom II x4 955 CPU, nVidia GF610, 6Gb, 500GB+320GB, MX14 + KDE
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