I am looking for a way to mount an external Micro SDHC card through the usb connection. I tried using a card reader and Astro and it didn't see it.
I want to do this since then I could transfer files from my Sony pcm M10 (digital audio recorder) without a computer. This could come in handy when I need to clear up some space when recording at a festival and dont have a computer with me.

not possible as of now... The usb adapter on the droid puts out no power so you cant really use anysort of device without an external power source. I believe a phisical keyboard was just recently abble to work on the droid. So as of now no you cannot. Howerver you could put the other micro sd card in your droid and then copy the files onto your phones memory.

Thanks for the response and info.