Understanding SD Card Symbols
SD Card Association classify the storage sizes or storage capacity of your SD Cards into (3) Types :
SD => If you see only the SD symbol it means it can only store 2GB of data and below. You can only store 1 complete movie or (more or less) 400 mp3 songs.) SD is an acronym for Secure Digital.
SDHC => If your SD Card is an SDHC or Secure Digital High Capacity it can store up to 32GB of data and below. (You can store more or less 32 complete movie for this capacity.)
SDXC or Secure Digital eXtended Capacity = you can store up to 2TB (Terrabytes) of data.
Note: SDXC requires a special formatting called exFAT filesystem. exFAT has been adopted by the SD Card Association as the default file system for SDXC cards larger than 32 GB.