You may save the current or previous system log (syslog) to an SD card. This can assist in debugging an application, CAT-DEV, or CAT-R.
To capture the console output from a CAT-R, see Serial Logging on the Wii U .
The log is saved as a text file on the attached SD card. It may be viewed on any PC.
The name of the syslog file follows the pattern:
2014/05/09 Added FAT32 step.
2013/05/08 Automated cleanup pass.