2M disks where formatted using 2MGUI to increase 3"1/2 & 5"1/4 DD/HD/ED disks' capacity.
Is there any way today to recover/dump these disks to a file with modern hardware? Specially the 5"1/4 ones...
I've got both kind of floppy drives but not controllers.
Adding a link to a tool suit to manage 2M disks under linux named Gtools
You can read more about here (spanish only).