don't know why this was downvoted. If I'm not mistaken, there is generally a high error rate per pore fundamentally because it's a single molecule experiment. These get averaged out, but may be difficult to align as it might not necessarily be a straightforward averaging. There are also segments that are fundamentally generally difficult to sequence correctly (single nucleide runs, not even a super high n) that will probably never get satisfyingly resolved no matter how many times you sequence.