--- title: "(Sponsored) STM32 USB SD Card Mass Storage Device Tutorial - Phil's Lab #148" url: https://daily.dev/posts/sponsored-stm32-usb-sd-card-mass-storage-device-tutorial---phil-s-lab-148-fki5bida8 source_url: https://www.youtube.com/watch?v=aEwwQMdKd-c type: video:youtube source: "Phil's Lab" published: 2026-05-31T07:45:22.381Z updated: 2026-06-04T02:13:07.351Z tags: ["c", "embedded", "stm32"] reading_time: 27 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # (Sponsored) STM32 USB SD Card Mass Storage Device Tutorial - Phil's Lab #148 **[Phil's Lab](https://daily.dev/sources/phils-lab)** · 27 min read · 0 upvotes · 0 comments ## Summary A step-by-step walkthrough of implementing a USB Mass Storage Class (MSC) device on an STM32H743 microcontroller connected to a micro SD card via SDMMC. Covers hardware schematic and PCB design decisions, STM32CubeIDE peripheral configuration (USB full-speed, SDMMC, clocks), and firmware implementation of the get_capacity, read, and write functions linking the USB MSC driver to the HAL SD card driver. Demonstrates real-world transfer speeds (~700 KB/s write) limited by the USB 2.0 full-speed interface, and shows how increasing the MSC media packet size from 512 bytes to 32 KB improves throughput. Future improvements mentioned include DMA-based transfers and USB high-speed. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#c](https://daily.dev/tags/c), [#embedded](https://daily.dev/tags/embedded), [#stm32](https://daily.dev/tags/stm32) [View this post on daily.dev](https://daily.dev/posts/sponsored-stm32-usb-sd-card-mass-storage-device-tutorial---phil-s-lab-148-fki5bida8)