The CMD FD-4000 Floppy Drive's Can Convert Disks from HD (1.4MB) to ED (3.2MB)

>This process only works with an FD-4000 drive. If you convert an HD disk to ED format, you won't be able to run over to your NeXT machine and start using like a NOS ED disk. My understanding is that this conversion only works with FD-4000 drives.

nah, it works with most ED drives https://ardent-tool.com/floppy/floppy.html#2.88_Floppy_Hack

"I can also format 1.44MB media to 2.88MB without drilling an extra hole in it. In fact, all media is automatically formatted at the drive's native capacity unless forced with the /F switch."

"1.44MB media seems to work well at 2.88MB. It formats error-free and seems to hold data with no problem. I am doing some long-term testing to see if it will retain data. "

I remember in High School in about 1995 when Dad and I made a jig to drill holes in 1.44MB disks to turn them into 2.88MB disks.

It worked on about 90% of the 50 or so we drilled, IIRC.