/**
  \example sdcard1.cpp 

  This sketch continually tries to access an SD card on the North face
  using the 'IXM SD Cell' connectivity pattern.  When it finds one, it
  reports the number of 512 byte blocks the card has, then switches to
  just checking that the card is still there.

  For this sample output, I first popped in and out a 2GB SanDisk
  card.  Later, I put in a 4GB card:
  \code
  Ln 18.137 Card found!  Block count = 3862528
  Ln 24.143 Card lost.  Ending.
  Ln 39.821 Card found!  Block count = 7563000
  \endcode
 */
