SCP media test in Linux, verify question?

I just started working on a media test for Linux re-using the source code from Keir Fraser.

I did a lot and so far it's working pretty well. For now, I'm writing a 4us flux for a total of 200ms.

I'm now reading back the data, but not sure how to do the compare. As we know the values are not always exact from read to read.

What is the margin error we can assume?

Also, the first 2-3 bitcells are often very far from original value. Is that normal?

How should I do the compare and assume that a track is ok?

Thank you.

If the first few bitcells are off a lot then you might need to increase the settle time for the motor on or head step.  That is not normal and would be drive specific.

My media test throws out the highest and lowest bitcell and does an average of all of the other bitcells, with result being within .1% deviation from what it should be.
ok thanks, will try that.

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