32gb ultra microSDHC not giving 30 mb/s transfer speed

I had purchased sandisk ultra 32gb microSDHC sandisk claims it gives speed of 30 MB/s but I had notice while transferring files from my pc its gives speed of 10 Mb/s why its give me low transfer speed ?

Write speed is usually lower than read speed, no matter what kind of memory card.

10MB/S is OK. This is still within the normal scope.