> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/extender-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/extender-manual/modes-of-operation/usb-drive-mode.md).

# USB drive mode

You can access the data on the microSD card without needing an external card reader. This is explained in the following steps:

1. Turn Extender ON. The Status LED will turn green.
2. Ensure no headsets are connected to Extender.
3. Plug Extender into a PC, your computer should detect it as a generic USB drive and after a few moments you should see it appear as a drive. You can now access the encrypted files on the disk.

*Note: All data stored to the SD card is encrypted and the EMOTIV App and a* [*PRO license*](https://www.emotiv.com/emotivpro/) *is required to decrypt the raw data.*


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://emotiv.gitbook.io/extender-manual/modes-of-operation/usb-drive-mode.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.