I would go : 1. count records 2. make copy 3. insert 4. ensure records = records + 1 5 if records != records +1 or file can be grepped, stat, filesize, then ass

I would go : 1. count records 2. make copy 3. insert 4. ensure records = records + 1 5 if records != records +1 or file can be grepped, stat, filesize, then assume is corrupted and rollback to copy