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Detail:
  Somewhere in the process of adding FAT16/FAT32 support, a bug was
  was introduced where an attempt was made to calculate the number of
  sectors in a cluster before the cluster size (in bytes) had been
  determined. This affected invalid (e.g. blank) image files, as well as
  old 160K/320K DOS floppies that aren't supposed to contain a valid boot
  block.
Admin:
  Issue raised by the Raspberry Pi NOOBS team when they failed to set up
  the DOS partition where FileCore was expecting it to be.

Version 1.02. Tagged as 'DOSFS-1_02'