The map was also afterwards. Easily recognized immediately from SD-LW in the car. (Bolero audio system in Octavia III). The selection of the subfolders on the map as well as play back tracks incl. Cover display works perfectly. Access in the car-LW - even when "Skip'en" - is really fast.
Am happy for this application 100%!
Let's see how the card with cold and heat in the car can handle. In the product characteristics is indeed promoted by SanDisk with immunity against it.
Anyone looking for a quick card for photographing in modern digicams, of course, should rely on a Class10 card (SanDisk Extreme or possibly -Ultra).
Conclusion:
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For music, however, these lower-priced 16GB Class 4 SanDisk is fully sufficient. -> Buy recommendation!