This updates information on the bulk copy (bcp) utility in Chapter 5, “Controlling Physical Data Placement” in the Performance and Tuning Guide:
Bulk copy utility
When you are using the bulk copy (bcp) to copy a very large number of rows, do not use -F for the first row and still use multiple input files. The -F option is for single processing and ad hoc copying, not the heavy-duty, multiprocess copying found in a production environment.