Re: "Yes, doing the 'radial alignment' is not that hard. I've never had any success with the 'digital alignment disks', I prefer a 'catseye disk' and an oscilloscope conencted to the differential outputs of the read amplifier." The digital alignment disks are intended for checking alignment to see if it needs to be done. It's not practical to use them for actually doing the alignment. It's not impossible, absolutely, but it's not a good way to go about it, nor was it really the intent of the digital disks.