Currently, under Cyanogenmod 9 (still in early development), USB mass storage works with some devices (http://forum.xda-developers.com/showthread.php?t=1374497), but not (or not so well) for others. It's a Cyanogenmod 9 development issue. Again, ICS is built to supports USB mass storage when the device has more than one partition. For devices that don't, we need good mtp/ptp support under Ubuntu.
@Zaiger:
Currently, under Cyanogenmod 9 (still in early development), USB mass storage works with some devices (http:// forum.xda- developers. com/showthread. php?t=1374497), but not (or not so well) for others. It's a Cyanogenmod 9 development issue. Again, ICS is built to supports USB mass storage when the device has more than one partition. For devices that don't, we need good mtp/ptp support under Ubuntu.