Here the process I follow to build a CM10 SD card for my 16GB Nook Tablet
- Create 3 partitions using MiniTool Partition Wizard Home Edition per the instructions in step #1 here: sdcard, system, and data. Make sure that you set the partition ID type for the sdcard partition to 0x0C FAT32 LBA and set its Active flag, otherwise the SDcard will not be bootable. Once this is done, the sdcard partition should appear as a (read/write accessible) drive under Windows. (Note that you can adjust the suggested sizes of the partitions upward to fill up the entire SDcard).
- Copy the following files from cm10-acclaim-0.06_sd_hd_10_11.zip (obtained here) to the sdcard partition: boot.img (in folder p2), flashing_boot.img, MLO, recovery.img, u-boot.bin.
- Replace updater-script in cm10-acclaim-0.06-full-of-bugs (in folder META-INF\com\google\android) with the updater-script from cm10-acclaim-0.06_sd_hd_10_11.zip (in folder p2).
- Replace updater-script in gapps-jb-20120726-signed.zip (in folder META-INF\com\google\android) with the updater-script from gapps-jb-20120726_sd_hd.zip (obtained here) (in folder p2).
- Copy to the sdcard partition cm10-acclaim-0.06-full-of-bugs and gapps-jb-20120726-signed.zip with the replacement updater-scripts files (which cause the CM10 ROM and JellyBean Google apps to be installed on the SDcard rather than on your NT itself).
You should now have a bootable SD card with 7 files on it, ready for the 2nd phase of the SDcard build described in step #4 here
Also, if your NT is like mine, you will have to plug in the powered USB cable to the NT in its power-off state -- in order for the NT to boot from the SDcard.