Why is feature class to feature class dropping rows

[GISLearner]

I'm running Feature Class to Feature Class on a nationwide Open Street Maps layer so I can get the data into my project's geodatabase. But for some reason, the output from the Feature Class to Feature Class tool contains less rows than the input layer. My computer has enough memory and processing power to run. Why is this happening? And how can I stop it from happening?

[DanPatterson]

is there a limit on what can be exported from OSM based on extent or some other issue.  If it were another featureclass in a gdb, then there may be a selection.  Perhaps you can identify spatially or by attribute what you think is missing.