Palm does not currently support the MiniSD cards on any device prior to the Treo 755p. MiniSD cards are used in the 755p (and 750) so playback should be fine with that device.

For other devices, if you use a Mini SD card, you might get unexpected results on your device. Specifically, you might see odd character names for the card in the Choose Songs screen. This is due to an issue in the Palm OS and unfortunately there is nothing we can do about it at this time.