Bill Greiman

You should probably use the File class. File was not a class in the original SdFat. It was added to the SD.h wrapper for SdFat and just returns the underlying...

Looks like you are using ESP32 or ESP8266. The class File is define in the system. You will have various conflicts with SdFat. I don't define File in ESP systems...

Can't help with the web server app, don't know anything about it.

> As an aside, I'm a little surprised that SdFat doesn't attempt to be as compatible with SD as possible to make swapping to the better library fairly seamless without...

Some older programs may fail if you use a file type that supports exFAT. file.size() and file.fileSize() will return type uint64_t for exFAT. Functions like file.seek(pos) require an argument of...

I have nothing to do with the Adafruit fork of SdFat. Ask them if they will update their fork.

I have no idea what's happening and I have given up on problems with the SAMD21 SPI library. You might try a slower SPI clock rate. Many SAMD21 boards fail...

The Nano 33 IoT has a SAMD21 processor. I tested SAMD21 by running the QuickStart example on a MRKZERO board and it works. I don't have a Nano IoT so...

I now have an Nano 33 IoT. I have tested many of the examples and it works with my SD socket and SD cards. I use a simple microSD socket...

The failure with exFAT is a check for an exFAT volume. You are using FAT and that succeeds. If you only want FAT32/FAT16 support, edit SdFatConfig.h at about line 81...