From nookDevs

Part of the Nook Tablet portal

Nook Tablet Partitions

mmcblk0p1 xloader

mmcblk0p2 bootloader

mmcblk0p3 recovery.img

mmcblk0p4 boot.img

mmcblk0p5 rom

mmcblk0p6 bootdata

mmcblk0p7 factory

mmcblk0p8 /system

mmcblk0p9 /cache

mmcblk0p10 /media

mmcblk0p11 /data

• mmcblk0p1 - MLO (raw partition image)
• mmcblk0p2 - u-boot (raw partition image)
• mmcblk0p3 - recovery (raw partition image)
• mmcblk0p4 - boot (raw partition image)
• mmcblk0p5 - Rom device specific files (serial number, etc) (vfat)
• mmcblk0p6 - Boot Data (vfat)
• mmcblk0p7 - Factory (factory.zip - flashable zip that returns NC to factory settings, rombackup.zip - backup of /rom/devconf/*) (ext4)
• mmcblk0p8 - System (ext4)
• mmcblk0p9 - Cache (ext4)
• mmcblk0p10 - Media (vfat)
• mmcblk0p11 - Data (ext4)

More info here

How To Dump

adb pull /dev/block/mmcblk0pX (where X is the partition you want to dump)

The above method will not dump the security permissions on the files and folders. To get complete images of each of the partitions you need enough space to dump each of the partitions on your sdcard and use the following commands from adb shell or in a terminal on the device:

dd if=/dev/block/mmcblk0pX of=/sdcard/name.img (where X is the partition you want to dump and name.img is the name of the file system. e.g. sytem.img, boot.img, etc)

To dump them back to their original location reverse the if(input file) and of(output file).