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So you are saying that the stats there are only confusing us, and I don't have 6% HW errors? I'm mining at btcguild, the diff in my Miner status is 128 under "Diff". Although I am curious what Diff1,DiffA,DiffR,DiffS,LSDiff all mean.
Well the screen is documented clearly in cgminer
https://github.com/ckolivas/cgminer/blob/master/README#L534AntMiner's lack of documentation in the web interface is their fault.
Though my post above I thought it was obvious that DiffA means Difficulty Accepted.
Usually(or all the time?) a HW error appears when a device reports an incorrect nonce(or a dupe?), but since the difficulty is set to 128, only shares below that target(higher diff shares etc) get accepted, so my error rate might actually be indeed lower since HW errors get reported before the share gets tested for it's difficulty.