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The uSDFS (microSD File System) is a port of ELM CHaN's FATFS to Teensy.
The port is based in addition to FATFS ff12b on
- K64 SDHC driver by Petr Gargulak (NXP Employee)
https://community.nxp.com/servlet/JiveServlet/download/339474-1-263510/SDHC_K60_Baremetal.ZIP https://community.nxp.com/thread/99202
- Teensy SPI port to FATFS by Karl Lundt
http://www.seanet.com/~karllunt/bareteensy31libs.html
and the
- Arduino SdSpi Library by William Greiman
https://github.com/greiman/SdFat
To read about some discussion on SdFat and FATFS concerning speed etc go to http://forum.arduino.cc/index.php?topic=281907.0
this discussion refers to Bill Greiman's own SdFat and a port of FATFS to Arduino by Jean-Michel Gallego https://github.com/gallegojm/Arduino-FatFs
Meanwhile there has been some work done by both Bill and ChaN, but as the approaches differ, so will the performance.
I have selected FATFS for the port as it has already implemented the exFAT file system, that most uSD > 32 GB are using.
To include the uSDFS file system use
#include "uSDFS.h"
See Configuration page on how to configure uSDFS