Nearly thousands of Memory Cards available from hundreds of Manufactures according to SD standards.Besides Brand names SD cards has different storage capacity ,speed classes and physical sizes.Generally available in three size category as SD Memory card, mini SD Memory card and microSD memory card.
Speed class of an SD memory card is associated with write and read speed,this are typical in video capturing devices such as Megapixel Mobile phones and Digital Cameras.
An SD memory card which is upto a maximum capacity
of 2GB available as Full SD ,miniSD and microSD
SDHC stands for SD High Capacity upto 32 GB from 4 GB available
as SDHC, miniSDHC and microSDHC nowadays most popular
with mobile phones