Wrong EBOOK_DIR_MAIN for iriver story hd (basic)

When I plug my Iriver HD (basic edition), it is detected but the book list is empty and no book can be uploaded.

Modifying line 35 of /usr/lib/calibre/calibre/devices/iriver/driver.py:

  EBOOK_DIR_MAIN = 'Book'

with:

   EBOOK_DIR_MAIN = 'book'

solves my issue.

I am using calibre 0.8.28+dfsg-1 on debian testing.

Here is the traceback I get when I try to upload a book to the device:

  calibre, version 0.8.29
  ERROR: Erreur: Erreur pendant la communication avec le lecteur électronique

  [Errno 2] No such file or directory: '/media/Story HD/Book/Jean, Benjamin'

  Traceback (most recent call last):
    File "/usr/lib/calibre/calibre/gui2/device.py", line 81, in run
      self.result = self.func(*self.args, **self.kwargs)
    File "/usr/lib/calibre/calibre/gui2/device.py", line 405, in _upload_books
      metadata=metadata, end_session=False)
    File "/usr/lib/calibre/calibre/devices/usbms/driver.py", line 260, in upload_books
      filepath = self.normalize_path(self.create_upload_path(path, mdata, fname))
    File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 1121, in create_upload_path
      os.makedirs(filedir)
    File "/usr/lib/python2.7/os.py", line 157, in makedirs
      mkdir(name, mode)
  OSError: [Errno 2] No such file or directory: '/media/Story HD/Book/Jean, Benjamin'