I have not used this particular file, but files of the format “60-persistent-storage.rules” tend to be part of the init process used in Linux boot (numbering is used as a way to indicate relative order of running the files). In this case it is a udev device special file rule for dynamically naming and existence of files in /dev. See:
You will sometimes find symbolic links in “/etc” subdirectories to the “/lib” version of the file for actual configuration. For udev there is “/etc/udev/rules.d”. Think of the “/lib” version as a library of init definitions, and “/etc” directories as a place to customize the rules. There is a README file in the “/etc/udev/rules.d” directory which has some explanation concerning customization.
I’m not positive, but you should probably be able to copy the original “/lib” file into the “/etc” directory and edit that without changing the file name (it is possible you’d need to bump the number up or down one, I have not tested this).