>> I love to know why the card does that 7-3 thing

You might want to check out this thread that explains that many =20
utilities do not "properly" format SD for optimal access:
http://www.adafruit.com/forums/viewtopic.php?f=3D31&t=3D20861&start=3D0&hil=
it=3Dfat16lib

BillW

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