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I know that current is the currently detected value, worst is the worst value the HDD ever had and threshold is the minimum value a healthy drive can have. I can judge the mechanical state of the drive by using only those 3 attributes. What is the point of data?

Can a a bad current/threshold exist while data is 0 (as an example reallocated sector count)? Or if I have a bad reallocated sector count data, how can current/threshold be OK?

TL;DR: What is the difference between Current/Worst and Data attributes?

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  • What? You know the difference be the first two; the data is there so you know what the current count is
    – Ramhound
    Commented Oct 3, 2014 at 18:30

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The data attribute is the RAW value stored by the disk, which has not been interpreted in any way. they reflect binary data, that may mean different things on different drives.

SMART analysis tools make assumptions about the data value when the convert the raw value into the Current and Worst values for analysis and display. Sometimes the data value 0x00 indicates a current value of 100, and worst of 100, which indicates that of the 100 instances before failure, you have used none of them. In the case of Reallocated Sector Count, the data counts down from the manufacturers determined threshold, but the current and Worst values count up, not down, until failure. It wouldnt make sense for you to see a value of 100 when you actually have 0 reallocated sectors, but see 0 when you have 100 of them.

Additionally, Since a SMART analysis tool like SpeedFan or SmartMon or palimpsest must understand the workings of many differant kinds of disks, their interpretation of the raw data may at times be inaccurate. The data field is displayed so that the user can take matters into their own hands in the case that the current metric is suspect.

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