BlackBerry Storm Micro SD card capacity for 9500/9530. as I know BlackBerry Storm supported 32 GB Micro SD card. But the 16GB micro SD card or micro SDHC card was enough for your BlackBerry Storm. Micro SDHC cards are FAT32.The BlackBerry Storm supports both SDHC and SD CARD. you can buy Dane-Elec 16GB microSDHC Card or SanDisk 16GB microSDHC Card for BlackBerry Storm.
SanDisk card is more expensive than Dane-Elec. these cards would store many media-rich files such as music, videos, and photographs.