I've meticulously followed the directions regarding the creation of a SD card for dual-booting noted here: http://www.androidtablets.net/forum/nook-color-technical/13156-how-cm7-bootable-sd.html. My NC recognizes the SD card for the initial boot involving the setup of the card. In watching the messages that scroll along during this process, I noticed toward the end (shortly before the NC powers off once the process completes) a few errors indicating something similar to: mv write error no space left on device. It goes by pretty quickly. When I then turn the NC back on, the SD card is ignored and the boot-up process continues into the stock OS. I'm using a new Amazon 8GB Class 10 SD card. I've used a utility to verify the SD card has no problem sectors and can read/write fine. In looking at the SD card after the setup process completes, the partition that can be read by Windows indicates a capacity of 115MB, with 107MB free. I've used SDFormatter after each attempt to re-initialize the SD card. The NC I'm doing this on has the latest 1.4.1 firmware revision. I couldn't locate an image file specifically for that version, so I've been trying the 1.3 image file available here: Index of /~green/nook. I've seen comments on other forums indicating this appears to work fine for others. I'll appreciate others troubleshooting ideas.