AllanB:
HiI'm exited about this library. I might have a troublesome SD Card module.
I keep getting an error code: 49. I cant find out what code 49 is.
If I use Arduino's standard SD example listfiles, I get a correct list of files on the SD card. The SdFat library from Google Code Archive - Long-term storage for Google Code Project Hosting. also read the SD Card with the same wiring. So the wiring must be correct. And I use SdPlay.setSDCSPin(10); as pin 10 is my CS pin.
Then I commented the line: SPSR |= (1 << SPI2X);
Same result.My sd module is this one http://www.lipoly.de/index.php?main_page=product_info&products_id=213383
I really hope someone can with this problem.
EDIT ----
It was not the SD Card Module but the SD Card itself. I tried with another one. Now it works.
Just my two cents, I had this same error and was to fix it by reformatting the sd as FAT. You may be able to do the same with your sd, but don't use the quick format or the card will give the same error.