I know this my seem odd and I could be 100% wrong but does anyone’s 4GB or larger SD Mini card have the SD Card Association’s logo (not the letters “SDHC” but the logo that shows SD above HC) and/or 2, 4, or 6 inside the letter “C”. This means 2MB, 4MB or 6MB per sec sustained transfer rate.

I believe these are the cards that WILL NOT work because the SD Card Association states that they are not backward compatible (inside they are completely different).

SD Association

I also believe the card manufactures that are not using the SD Card Association’s standard are each off on their own tangent and that is why some cards work and others do not.

The above information is correct to an extent. It only applies to the SD memory card (sorry). There are no standards for MiniSD High Capacity cards at all. So… the previous paragraph still fits.