When the Barnes & Noble Nook Tablet was first rooted, many members noticed that they had only 1 GB in media and 11 GB in their /data partitions. Because of this sub-optimal partition scheme, many members started an effort to fix this irregularity. XDA Forum Member tselling managed to fix the problem by releasing a guide that will successfully re-partition those 11GB so that the precious memory could be used for something more useful.
Word to the wise, the process is long and complicated, so it definitely not something that should be done unless you have a lot of time on your hands. Basically, it involves making a backup—something that everyone should be doing anyway—and using ADB to re-partition the internal memory of the device. If attempting, be sure you read the commands carefully and enter them exactly or something could go very wrong. By the end, your partitions will look something like this:
1 131kB 262kB 131kB xloader
2 262kB 524kB 262kB bootloader
3 524kB 16.3MB 15.7MB recovery
4 16.8MB 33.6MB 16.8MB boot
5 33.6MB 83.9MB 50.3MB fat32 rom
6 83.9MB 134MB 50.3MB fat32 bootdata
7 134MB 522MB 388MB ext4 factory
8 522MB 1164MB 642MB ext4 system
9 1164MB 1611MB 447MB ext4 cache
10 1611MB 11.6GB 9989MB fat32 media msftres
11 11.6GB 15.9GB 4326MB ext4 userdata
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