Add extra Storage to the Raspberry Pi Pico with W25Q128 and LittleFS
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The Raspberry Pi Pico comes with 2 MByte FLASH. If more is needed for example to store data or for a data logger, this article shows how it can be extended with a 16 MByte serial flash using the LittleFS file system.
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Raspberry Pi Pico (c-sdk)] Storage: Ep2. Multi external flash
Raspberry Pi, Page 239
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software, MCU on Eclipse
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[Raspberry Pi Pico (c-sdk)] Storage: Ep1. Builtin XIP flash & external
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Getting Started with Raspberry Pi Pico W using MicroPython
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Add external SPI Flash Memory to Raspberry Pico - 1: hardware
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Erich Styger, MCU on Eclipse
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Raspberry Pi Pico W - Raspberry Pi RP2040 chip, Wi-Fi
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Raspberry Pi Pico – Micro SD Card – Photo Frame -– 3.5 Inch