There are several things to remember about large, non-standard, floppy disks:
Windows NT does not reliably write any of the non-standard formats.
Any size over 1.68M has very unstable and undependable support among floppy disk drive hardware.
The traditionally used rawrite utility for MSDOS cannot write large floppy formats — use WinImage instead.
Under Windows NT, WinImage has problems writing disks over 1.68M.
Some drives cannot handle large format floppy disks; the Toshiba Tecra notebook and its floppy drive, for example.