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Any idea what is the maximum class supported by HTC Desire HD? I have one 4GB Class 10 microSD card, and its not able to read it...

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Have you tried using the card in any other devices/readers? How is it formatted? I don't believe that the speed class of the card typically has any bearing on whether or not a device can read it (unless the device for some awful reason doesn't properly implement the SD spec). – eldarerathis Jun 4 '12 at 19:06

The speed classification of an sdcard under no circumstances compromises compatibility.

That said here's what you can try:

  • Format the sdcard inside the phone
  • Make sure it works with an external card reader
  • Make sure it works in another phone
  • Make sure your phone can use other cards.
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@RichardBorscik Thanks... How to format the SD card? – Jwalant Natvarlal Soneji Jun 4 '12 at 19:51
@Jwalant Should be: Settings -> storage -> Unmount -> Format sdcard – Richard Borcsik Jun 4 '12 at 20:05

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