Fuze+ microsd card not recognized?

Hi, i have an Fuze+ 4GB und bought me an sandisk 8GB micro sdhc card and get the same error messages. But when i use the usb-micro sdhc adapter thats worked on my pc, only the fuze+ cry thats the format was wrong. when i use the integrated formation tool i get the error: no usd card found. newest firmware is allready installed, checkdisk was OK. any sollutions? thanks for support