need help with my sd memory card

can some one help me i was playing my ds with my r4 i putted the micro sd in the reader so i could put some new games on and it said it need to be formatted so i tryed to format it but it keeps sayin windows could not complete the formatting can someone help

Try on a different USB port. If it still has trouble, try a different MicroSD to USB adapter (I have two, heh).Most of the time, it's an I/O error.