I/O error on copy large file

That’s impossible! It cannot be! Another failed memtest?

According to @truenas-fan, memtests are useless.

@truenas-fan, can you explain why the OP is wrong and how they need to investigate elsewhere to narrow the problem?

Please, @truenas-fan. We are pathetic “so-called” experts who haven’t a clue about “deep digital systems knowledge”.

In the meantime, the list keeps growing.

Important PSA so people will not waste precious time with pointless memtests.

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