I have a SanDisk 8GB microSDHC Class 6 card which I ordered from MobilePlanet that came with a microSDHC-to-miniSDHC adapter. As mentioned in an earlier post, it worked everywhere (Sony VAIO, PS3, Dell running Ubuntu, Vista) BUT on the Nokia N810.

I have since tested the SAME 8GB microSDHC in Kingston and Palm microSDHC-to-miniSDHC adapters in the Nokia N810, and they work!

I'm currently using my 8GB Sandisk microSDHC in my Nokia N810 using a Palm microSDHC-to-miniSDHC adapter. I've been running it solid for over a week now without any errors. I have yet to see the "unmounted mmc" issue described here and elsewhere.

At least for me, there appears to be a definite issue with the adapter from SanDisk. Using an adapter from another manufacturer seems to solve the issue. From my own experience, I'd recommend a Palm adapter for a solid connection without random disconnects/umounts.