# Overview

Source: [https://docs.qualcomm.com/doc/80-70014-6/topic/storage_overview.html](https://docs.qualcomm.com/doc/80-70014-6/topic/storage_overview.html)

Understanding the storage features and device types supported on the  Qualcomm®  QCS6490 platform enables developers to configure, customize,
            and deploy storage capabilities in an optimal, efficient way.

- Universal flash storage (UFS) versions 2.1/2.2 and 3.1. 
Note: Universal flash
                    storage (UFS) is an open standard set by the Joint Electron Device Engineering
                    Council (JEDEC). It is a high-performance storage interface designed to minimize
                    power consumption. Its high-speed serial interface and optimized protocol enable
                    significant improvements in throughput and system performance.
- SD card version SD v3.0, 4‑bit

Storage is used for the following use cases on this platform:

- **Boot from primary storage device**
    Store the required images to boot up the
                    Qualcomm QCS6490 platform by reading the images (XBL, AOP, TrustZone, kernel,
                    and so on) from UFS
- **UFS has a partition that saves user-specific data**
    For example, videos,
                    photos, documents, and so on.
- **Support read only logical unit number (LUN)/region**
    Used for storing images
                    such as TZ, CDT, and so on.

Note: 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.

Last Published: Jul 10, 2024

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