Sorry to say that, but my suggestion would be to sell it, and buy exactly same one but class 4. It is *much* more efficient, when using it for swap on microSD, Easy Debian, and things like that. Class 10 cards are inferior @ random read&write - their only advantage is (much) faster bulk write speed (sometimes, bulk read to).

Also, there is no much sense on using both internal swap and swap on microSD with same priority - use swap *only* on microSD. The main benefit from such setup, is that You're free of I/O conflicts, between opt (/dev/mmcblk0p2) and swap (/dev/mmcblk0p3). Performance gain from simultaneous usage of both swaps is negligible (You can google for flash RAID 0 article, it's much laugh to read. Almost, like floppy RAID 0 one).

/Estel