Create VDI in TiB from terminal (VBOX)

#!/bin/bash

echo " You may use, edit and share if you like to, but credit the original creator"
echo "when you share and/or edit this script."
echo ""
echo "WARNING!: By no means, is the script creator liable for any damage"
echo "this script creates, either softwarematic or otherwise."
echo "Use it at your own risk!"
echo ""
sleep 3

echo "This script will create a Virtual Harddisk (vdi) in the current"
echo "or provided directory"
echo "Please, put in the amount of TiB you want to use in the X.XX format"
echo "Example: 2.32 or 4.00"
echo ""
echo "[Press ENTER to confirm after input]"
read -r tsize
echo ""
echo "How do you like to name the Harddisk? You can put in a location as well."
echo "Example: HDD.vdi or /home/$USER/My Folder/HDD.vdi"
echo 'WARNING!: Writing locations like "~/" will not work!'
echo ""
echo "[Press ENTER to confirm after input]"
read -r vdi
echo ""
msize=$(echo "$tsize" \* 1048576 | bc)
rsize=${msize::-3}
echo "The $vdi virtual disk with a size of $tsize TiB, or $rsize MiB"
echo "will be created. Do you want to proceed?"
echo ""
select pc in "Proceed" "Cancel"; do
    case $pc in
        Proceed ) VBoxManage createhd --filename "$vdi" --size "$rsize" --variant Standard; echo ""; break;;
        Cancel ) break;;
    esac
done
echo "This script was written by Erwin Oldebesten on 14/06/2017"