Tech Note 030 - ESP8266 Using SPIFFS to replace SD Card storage
Using the SPI Flash File System on the ESP8266 in-place of the SD-Card hardware based system. In most instances the implementation of SPIFFS is straightforward and relatively easy to do.
Examples are provided here: https://github.com/G6EJD/SPIFFS-Examples
SPIFFS Documentation here: https://github.com/esp8266/Arduino/bl...
PDF of slides:https://github.com/G6EJD/SPIFFS-Examp...