If you search, you will find several threads that say that the Sandisk MicroSD to MiniSD adapters do not work in the N810. Some people reported success with the cheap adapters from EBay. I just bought the "Kingston 8GB Micro SDHC Mobility Multi Kit Model MBLY/8GB" from Newegg. It has a MicroSD card and adapter. Its at:
http://www.newegg.com/Product/Produc...82E16820134795

It worked fine. But I was surprised how far you need to stick it into the socket in the N810. You really need long fingernails or a little screwdriver to push it in. It will click into place when you've done it right.

I think that we need a sticky about the Sandisk adapters not working.