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By sindani77
#88522 Even though file system is stored on the same flash chip as the program, programming new sketch will not modify file system contents. This allows to use file system to store sketch data, configuration files, or content for Web server.

The following diagram illustrates flash layout used in Arduino environment:

|--------------|-------|---------------|--|--|--|--|--|
^ ^ ^ ^ ^
Sketch OTA update File system EEPROM WiFi config (SDK)

File system size depends on the flash chip size. Depending on the board which is selected in IDE, you have the following options for flash size: also check fake credit card generator