Trouble with SD card in Prestigio Multipad PMP3370B
I think the problem is the fact that it is a SDHC card. SDHC cards are rather new, and are not supported yet in most devices. So maybe you could try to find a normal SDSC card (from digital camera, friends, family..) to test if it works with that type.

The reason why SDHC cards are not yet supported in some devices is because it uses another type of Card-Specific Data (CSD) register. This results in some compatibility issues with some (older) devices. But if you want to know more about this, I recommond to use Google.

I would think though that a new device like yours (because it has Android 4.0) would support this already.. I haven't heard of the brand before, so I don't really know the quality of their devices.

EDIT: The device should support SDHC cards up to 32GB according to the specs, so that can't be the problem. I suggest contacting the support then, maybe they can tell you what is wrong and what you can try..