i dug up the undocmented fdisk thing and here it is https://youtu.be/th8wOjigxwU
on DOS 6.22 it just partitions it immediately, on Win98 it updates drive letters and immediately formats it as FAT32 if a partition is defined as being bigger than 2GB

syntax is as follows

FDISK <physical drive number, 0 being unused> /pri:<primary partition size> /ext:<extended partition size> /log:<logical partition size>