HP 1660AS Gotek drive mod

#!/bin/bash
# usbfd; A utility script to manage multiple floppy images on a single USB stick
# Tested on a GOTEK 1000 floppy model
# v. 0.91 Dennis Meulensteen 2013 dennis@meulensteen.nl -
# This is unsupported software because I don't have the time to provide support
#
#This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the included
#    GNU General Public License for more details.
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#Some variables with default values
TASK="none"
DEVICE="/dev/sda1"
DEVICEDEFAULT=1
OFFSET=1572864
# Must be root for mounting, so check
if [[ $EUID -ne 0 ]]; then
   echo "You must be root to do this." 1>&2
   exit 100
fi
#handle the options first
while getopts  "fmuUld:o:" flag; do
#  echo "$flag" $OPTIND $OPTARG
#in order of ascending innocence so innocent options override dangerous ones if someone decides to throw the alphabet at us
  case "$flag" in 
  f) TASK="Format";;
  m) TASK="Mount";;
  u) TASK="UnMount";;
  U) TASK="UnmountAll";;
  l) TASK="List";;
  d) DEVICE=$OPTARG
     DEVICEDEFAULT=0
  ;;
  o) OFFSET=$OPTARG;;
  ?)
    echo "Invalid Option.Usage: usbfd -[OPTIONS] [OPERANDS]"
    echo "Valid Options are:"
    echo "  -f format one or more floppy images (for a minimum of security you must also provide -d [DEVICE])"
    echo "  -l to list mounted images"
    echo "  -m to mount one or many images"
    echo "    up to $(ls -1 /dev/loop? | wc -l) floppy images can be mounted."
    echo "  -u to unmount one or many images"
    echo "    if -m or u are used you must provide at least one number between 0 and 999 to mount the respective image(s)."
    echo "  -U to unmount all mounted images at once"
    echo
    echo "  -d DEVICE to set the device your USB stick is at ($DEVICE)"
    echo "    the choices are "$(ls /dev/sd?)
    echo "  -o NUMBER Provides an offset that corresponds to the distance between the images in bytes ($OFFSET)"
    echo
    echo "OPERANDS are one or many space seperated whole numers or ranges {N..M} corresponding to images on your USB stick"
    echo "  example of mounting: #usbfd -md $DEVICE {0..9} 12 18"
    echo "    {N..M} indicates a range of floppy images to operate on, -f and -u also take ranges."
  ;;
  :)
    echo "Missing argument for $OPTARG"
  ;;
  esac
done
#gets rid of all the complicated switches and their parameters, leaving just the arguments
shift $(($OPTIND - 1))
  case "$TASK" in
  "Format") 
    FNAME=$(mktemp) 
    rm $FNAME
    if [ $DEVICEDEFAULT == 1 ]
    then
      echo "Formatting is dangerous! You must explicitly provide a device (-d)"
      exit -1
    fi
    for NUM in "$@"
    do
	FLOP=$(printf %03d ${NUM%})
	# Check the given file exists #
	if [ -d "/media/usbfd$FLOP" ]
	  then
	    echo "usbfd$FLOP is already mounted, try -u first"
	  else 
	    mkfs.msdos -vC $FNAME -n FDISK$FLOP 1440|grep volume #using mkfs repeatedly because of the random volume ids and labels
	    let MYOFFSET=$OFFSET/512*$NUM
	    err=$(dd if=$FNAME of=$DEVICE seek=$MYOFFSET bs=512c count=36 conv=noerror &> /dev/null) || echo "Format failed on disk $FLOP" #only copy what we need
	    rm $FNAME
	fi
    done
  ;;
  # mount
  "Mount") 
    for NUM in "$@"
    do
	FLOP=$(printf %03d ${NUM%})
	# Check the given file exists #
	if [ -d "/media/usbfd$FLOP" ]
	  then
	   echo "usbfd$FLOP is already mounted, try -u first"
	  else
	    mkdir /media/usbfd$FLOP
	    let MYOFFSET=$OFFSET*$NUM
	    mount -o loop,offset=$MYOFFSET,sizelimit=$OFFSET,users,rw,umask=000 -t msdos $DEVICE /media/usbfd$FLOP || rmdir /media/usbfd$FLOP
	fi
    done
  ;;
  # unmount
  "UnMount") 
    for NUM in "$@"
    do
      FLOP=$(printf %03d ${NUM%})
      if [ -d "/media/usbfd$FLOP" ]
	then
	  umount /media/usbfd$FLOP
	  rmdir /media/usbfd$FLOP
	else
	  echo "usbfd$FLOP was not mounted."
      fi
    done
  ;;
  # unmount all the usbfd... mounts
  "UnmountAll")
    for dir in /media/usbfd*/
    do
	dir=${dir%*/}
	if [ -d $dir ]
	then
	  umount /media/${dir##*/}
	  rmdir /media/${dir##*/}
	fi
    done
  ;;
  "List")
    for dir in /media/usbfd*/
    do
	dir=${dir%*/}
	if [ -d $dir ] 
	then
	  echo "Mounted: $dir"
	fi
    done
  ;;
  esac

# mount gotek floppies
sudo usbfd -d /dev/sde1 -m 22 23 24
# unmount gotek floppies
sudo usbfd -d /dev/sde1 -u 22 23 24