> For the complete documentation index, see [llms.txt](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/basic-information/sd-card.md).

# SD Card

## What Is It For?

The SD Card acts as the system’s external hard drive, where the following are stored:

* **General settings:** Global device parameters (language, theme, etc.)
* **Models:** Each created model has its own configuration file
* **Startup screen:** See more information [here](/linemaster-2.4ghz-zephyr/resources/startup-screen.md)

{% embed url="<https://www.youtube.com/watch?v=luY4QEwenn4>" %}

{% hint style="info" %}
The SD card is **included** with the product—pre-installed and ready to use.
{% endhint %}

{% hint style="danger" %}
Do not modify the contents of the SD card beyond what is recommended in this manual.\
Doing so may cause unexpected errors and is at your own risk.
{% endhint %}