function add_drive () {
  local name="$1"
  local label="$2"
  local size="$3"
  local filename="$4"

  log_progress "Allocating ${size}K for $filename..."
  fallocate -l "$size"K "$filename"
  echo "type=83" | sfdisk "$filename" > /dev/null
  local partition_offset=$(first_partition_offset "$filename")
  losetup -o $partition_offset loop0 "$filename"
  log_progress "Creating filesystem with label '$label'"
  mkfs.ext4 /dev/loop0
  e2label /dev/loop0 "$label"
  losetup -d /dev/loop0

  local mountpoint=/mnt/"$name"

  if [ ! -e "$mountpoint" ]
  then
    mkdir "$mountpoint"
  fi
  sed -i "\@^$filename .*@d" /etc/fstab
  echo "$filename $mountpoint ext4 utf8,noauto,users,umask=000,offset=$partition_offset 0 0" >> /etc/fstab
  log_progress "updated /etc/fstab for $mountpoint"
}