The SanDisk micro-to-miniSDHC is a straight passthrough connector. I don't see any ICs or changes to the SDHC pinout particular to this adapter.

Nokia appears to have a real issue recognizing the adapter. I don't think it's specific to SanDisk, and suspect any other (Kensington, etc) microSDHC may have the same issue.

I'm not too happy about this. Nokia changes from SDHC to mini-SDHC between the N800 and N810. Users attempt to be forward thinking and buy a microSDHC with a miniSDHC adapter, and we get screwed?

Nice going, Nokia and their engineers!

...

Again, please note that this same 8GB microSDHC and this same miniSDHC adapter works in an HTC Wizard running Windows Mobile 6, in a Sony VAIO, and a Dell PowerEdge. The ONLY device that does not recognize the miniSDHC adapter or 8GB microSDHC is the Nokia N810. What does that tell you?