> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Storage overview

The Qualcomm® Linux® storage guide describes the features and supported device types, enabling you to configure, customize, and deploy storage capabilities optimally and efficiently.

The following table lists the supported storage types.

| Storage type                       | Version          | Supported SoC                                                                                             |
| ---------------------------------- | ---------------- | --------------------------------------------------------------------------------------------------------- |
| Universal flash storage (UFS)      | v2.1, v2.2, v3.1 | All                                                                                                       |
| Embedded multi-media card (eMMC)   | v5.1             | QCS5430, QCS6490, Qualcomm Dragonwing™ IQ-615, Qualcomm Dragonwing™ IQ-8275, Qualcomm Dragonwing™ IQ-9075 |
| Non-volatile memory express (NVMe) | v1.3             | Dragonwing IQ-8275, Dragonwing IQ-9075                                                                    |
| Secure digital (SD) card           | v3.0             | QCS5430, QCS6490, Dragonwing IQ-9075                                                                      |

## Storage use cases

* **Boot from the primary storage device**: Store the required images to boot up the device by reading the images such as XBL, AOP, Qualcomm Trusted Execution Environment (TEE), and kernel, from storage.

* **Save user-specific data**: Store customized information such as videos, photos, and documents.

* **Support read-only logical unit number (LUN)/region**: Store images such as TEE and CDT. LUN is an independent processing unit on a UFS device.

* **Stores data in an authenticated, access-controlled, replay-protected manner in RPMB LUN/partition**: Replay protected memory block (RPMB) is a well-known LUN (WLUN) in UFS device and a special partition in eMMC.

<Note>
  - See [Hardware SoCs](https://dragonwingdocs.qualcomm.com/Hardware-SoCs/IQ-9075) that are supported on Qualcomm Linux.
  - Configure the device to boot from only one storage source. Use the second source only to store files. If both have bootable files, the system might crash or behave unpredictably.
  - Detailed information on the storage hardware architecture is available to licensed
    developers with authorized access. For more information, see [Qualcomm Linux Storage Guide - Addendum](https://docs.qualcomm.com/doc/80-80023-6A_129514/topic/overview-addendum.html#overview).
</Note>