Is there a way to force an usb drive to always get a specific letter in /dev/sd*? I know about udev symlinks, that does not help.
You need a custom UDEV rule to set this up. Plug the device in and you can find out the vendorid and productid with ...
this will show several lines that look something like this...
From this you can see that ...
As the device is a storage device we will be writing the rule in
This informs udev-manager, that if any storage device with vendorid 04fc and productid 0c25 is plugged into the system to add a symlink in
From now on you can access this drive with
I used this Source for the example.