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third_party/tinyusb/examples/device/msc_dual_lun/README.md

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+# MSC Dual LUN
+
+A USB Mass Storage device that presents two logical units (LUNs), each a small in-RAM FAT12 disk.
+
+## What it does
+
+- Exposes two LUNs, each a 8 KB FAT12 RAM disk containing a `README.TXT` file (`TinyUSB 0` and `TinyUSB 1` volumes).
+- Both disks are read/write by default, so host changes are written back to RAM (unless built read-only).
+- Pressing the board button marks LUN1 as "not ready" to simulate removable media being absent (e.g. SD card removed).
+- Reports a custom SCSI inquiry: vendor `TinyUSB`, product `Mass Storage`, revision `1.0`.
+- Runs under no-OS, FreeRTOS or ThreadX (USB device and LED blink as separate tasks under an RTOS).
+- LED blink rate indicates bus state (not mounted / mounted / suspended).
+
+## USB Descriptors
+
+| Interface | Class driver |
+|-----------|--------------|
+| 0 | MSC (mass storage) |
+
+## Configuration
+
+Notable `tusb_config.h` settings:
+
+```c
+#define CFG_TUD_MSC               1
+#define CFG_TUD_MSC_EP_BUFSIZE    512
+```
+
+## Building
+
+CMake:
+
+```bash
+mkdir build && cd build
+cmake -DBOARD=raspberry_pi_pico ..
+cmake --build .
+```
+
+Make:
+
+```bash
+make BOARD=raspberry_pi_pico all
+```
+
+## Try it
+
+After plugging in, two removable drives appear on the host, each containing a `README.TXT`. Open or modify the files to exercise reads and writes. Press the board button to make the second drive report "not ready" (medium not present).