[blue68f100]

I'm not sure I would play with any drives swaping till we get more info. I do not want to do anything that will compromise the data. I am assuming that you do not have a current backup.

Any time you get a SuperBlock error it is criticle.

I was thinking of powering down and use DD to clone the drives. Use a Sharpy Pen and mark the drive positions, must beable to re-install back into the original position. But it must be the same size to do a RAW Copy. Or a std clone to a file will have to be done. Doing this for each drive will tell us if a drive has a problem.

1 drive is a mfg than the others. This should not cuase a problem if the capacity is the same.

The reason I mentioned SpinRite is that it is not OS dependent. It uses the smart system to verify each sector, byte by byte, by reading multiple times to verify the bytes. If unknow it starts shifting the timing were it can read slightly before and after. Tring to determine what it should be. If bad it will swap a reserve sector in to correct the bad.