what operating system? sounds like you're using the 09hr as the card reader. what if you take the SD card out and put it in an actual card reader? try a different usb port if you continue to use the 09hr as the card reader. I have a mp3 player that wouldn't mount on my system but would charge and show it connected to resolve it, I had to disconnect a USB webcam. You have rebooted right?
Thanks for your reply.

I´m a iMac user. Well, I'm not in front of my home computer right now, but I guess my OS is the last one available. Anyway, I've been using my recorders ( R-09 and R-09HR) with this very same computer for like 2 1/2 years. No problems at all. It's very weird.
I'll try a different USB port and see what happens. Last night I did try everything I could: factory reset,different card, reinstall R-0HR software etc. Nothing seems to work.
Every time I try to drag a file to my HD nothing happens.
I really don't know what to do.