Barnes & Noble produces 8GB and 16GB versions of the Nook HD and 16GB and 32GB versions of the Nook HD+. If you're not sure which version you have, you can check the device's storage capacity to ascertain the version. While you're at it, you can also see how much available space is remaining and which content categories are consuming the most space.
The Nook HD offers a Storage Management feature that provides information pertaining to the current capacity and available space. You can find this data by tapping the "Settings" icon followed by "All Settings" and then "Storage Management." The capacities will register around 5, 13 or 28GB for the 8, 16 or 32GB versions, respectively. Tapping the right arrow presents a breakdown of available space, complete with a categorical list that details which content types consume the most storage.
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