Re: 4100 Unknown disk operation error
You will be surprised what Spinrite will find. I did that on my 400gig's I installed in my 4500. MFG no longer check the media for bad sectors. They rely on the SMART tech to make the repair on the fly.
A closer detail of the logs may indicate which drive is having the problem.
As far as replacement drives. You can go larger in all positions execpt drive 1. The Snap OS uses drive 1 to base the capacity off of. Then there were several Quantiums that had the same model and size but were actually different.
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