Failing to format flashdrive to UDF

I'm trying to create a UDF partition on a flash drive to install grub2 (to boot ISOs from) ~$ export DSK=/dev/sdd # wipe the disk ~$ sudo dd if=/dev/zero of=${DSK} bs=512 count=2048 ~$ sudo sgdisk --zap-all ${DSK} # create partition for udf ~$ #sudo parted -s ${DSK} mklable msdos ~$ #sudo parted -s ${DSK} -a optimal unit MB -- mkpart primary 1 -1 ~$ (echo o; echo n; echo p; echo 1; echo ; echo ; echo t ; echo 6 ; echo w) | sudo fdisk -b 512 ${DSK} ~$ sudo mkudffs --media-type=hd --blocksize=512 ${DSK}1 trying to change type of multiple extents