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Why is it only on some HDDs and some Removable Devices do I have the last block in the Error Scan unchecked?

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It's probably the visualisation, the drive might not divide evenly in 166kb chunks. I think it's "good enough" as it is. Pick a bigger size for visualisation: not using the full size of the visualisation area effectively. Pick a smaller size for visualisation: it won't fit in the space given. –  ta.speot.is Jan 16 '13 at 20:52
    
@ta.speot.is But doesn't this mean the partitions are not alligned? If hdtune can't properly divide the chunks this means the first partition was created at the wrong offset right? –  Alexander Ceed Jan 16 '13 at 21:07
    
If you had two cells on screen to visualise scanning a 9kb drive, it probably makes just as much sense to make each cell represent 9kb than 5kb, or any other value. So you'd have one, unfilled block. –  ta.speot.is Jan 16 '13 at 21:11

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