Here is my experience. Windows 10 or MacOS 10.13 zoomfloppy v7
1541, 1541–II work fine in all regards.
1581, 8050 work only if disk was formatted first (connect drive to your PET, c64, etc... and format). In other words I can write good disks from openCBM but it cannot format them. Use a c= to format first.
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