MyRIO USB file path

I am creating data acquisition VI's for myRIO that save to a USB thumb drive connected directly to myRIO. However, for whatever strange reason sometimes myRIO changes the USB drive designation from say (U:/ to V:/) and recently from V:/ to W:/ . I am wondering what would cause myRIO to behave this way so I can avoid this happening in the future.
Thanks
Solved!
Go to Solution.

Assuming you are using the myRIO-1900 then yes, the one assigning drive letters is the myRIO and the way it performs this operation is the same described above (see manual, page 13).
The difference lies in the OS that is running on the device (RT Linux). The process that is mounting things automatically is pretty nested inside all of the other processes on the device. It's called mdev. Looking on the system folders, check the following locations: /etc/mdev.conf (configuration file), plus, /etc/mdev/automount.sh and /etc/mdev/usb.sh (these files contain rules for mounting devices)
That being said, you can modify the contents of these files to force static drive letters. Unfortunately modifying the default behavior is something we cannot help you with (not recommended), but looking at the bright side, you can back up the files and play around with the options, plus, there is plenty of documentation out there to figure things out.
I hope this helps
Alejandro | Academic Program Engineer | National Instruments

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