On Wed, 9 Aug 2017, Chuck Guzis via cctalk wrote:
There's also the possibility that the drive alignment is so far out of
whack that you're not seeing the data on the SCP disks. This is
unlikely in drives that haven't been diddled with, but unless you bought
the drive NOS, you don't know that.
While radial alignment would get in the way of reading those disks, it
shouldn't affect his attempts to format a disk
Grab a known-good 8" floppy--the format doesn't really matter, as long
as it's fairly IBM 3740 compliant (Single-side, single-density, 128 byte
FM sectors). An RX01 floppy is good for that. See what IMD shows.
It is not clear whether the issue is with the disks, or with the hardware