I was under the impression that if you are using multiple files in your filegroup to store your data that the data should be written evenly across the files.

I have 5 files and the data is being written to only one file which is growing rather large, while the other files are still at 5 - 7 MB. They are all marked for Automatic Growth at this point, but only the 1 file is growing.

Is there something else that needs to be done to enable this? BOL left me with the impression that this is automatic.