Transcend 4GB JetFlash 110 USB 2.0 Flash Drive (TS4GJF110) Media "30 mb" Questions

my 4gb sd card showing only 30 mb how to get again 4gb Sir Format your SD card

...30/64 GB pendrive.data is being written but not being read.how to repair? some times after writing the data some parts at the beginning say 500 MB are read but later they are not read.Though property ...