# Storage To add support more features in the future in the wallet additional external storage space might be required. Having larger storage will also allow for more graphical objects, ability to store images for NFTs and design a better user experience. External Flash Memory will be used to store non-secure applications only and will never store private keys associated with cryptocurrency accounts. All communications between Secure Microcontroller and the off-chip flash memory will be handled through OTF (On the Fly) encryption, which means data that exits microcontroller through the communication interface will be already encrypted and when retrieved will be decrypted in the microcontroller. AES keys are stores in the microcontroller and will never leave the secure domain. ## Storage Spec: * **Capacity:** 16 MBytes * **Type:** Non-Volatile Flash --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.citadelwallet.io/wallet-spec/hardware-spec/storage.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.