from reading the manual it looks like the z1 falls under group 4 head units, which will have touch screen operation of teh usb unit.
this is directly from teh manual:
Folder number—track number—play time—
folder name—file name—album title—track
title—artist name
# If the characters recorded on the audio file are
not compatible with a head unit, those characters
will not be displayed.
Notes
! When using this unit as an external unit, head
units can display the first 8 letters of the folder
name, the file name, the album title, the song
title, the artist name.
! If the characters recorded on the audio file are
not compatible with a head unit, those characters
will not be displayed.
! If specific information has not been recorded
on an audio file, title or name is not displayed.
! The text information of some audio files may
not be correctly displayed.
! You can scroll to the left the folder name, the
file name, the album title, the song title, the
artist name.
read the manual maybe i misunderstood something, but im probably gona get this and try it out.