I have been having a hard time getting my T4.0 to talk to an SD card. A friend has a T4.1 that works fine.

I went back to review what I had done when I noticed an inconsistency in the published schematics for the T4.0 and T4.1
(https://www.pjrc.com/teensy/schematic.html)

T4.1 has DAT2 on SD_B0_04 and DAT3 on SD_B0_05. The T4.0 has these reversed.

If this just an error in the schematic? If not I could understand why my T4.0 is not working in that I have two of the data lines reversed.