Originally Posted by yankgirl
Hi! Does anyone know if there is a difference between the SanDisk MicroSD or SanDisk MicroSDHC cards?...
Physically, they are identical.
They are quite different in terms of their logic. Readers that aren't specifically designed to handle SDHC cards (whether standard or Micro) can't read them reliably, if at all. The same applies to SDXC cards, which are the newest type of large capacity cards in the SD family.