Nes SD cards not detected

I have a number of new SD cards but are not detected. If I'll insert my old SD card it's detected even I have emptied the files. Right clicking to reformat is not working either, can someone help?
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More about cards detected
  1. Is the new card SDHC? Some older readers will read SD but not SDHC. SDHC cards are typically 4GB or greater.
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