Does tcpdump guarantee packet integrity?

Question

1. In normal use of tcpdump without any parameter, does it guarantee?

   tcpdump -i eth0 -w file.pcap

2. In using tcpdump rotating by time with -G parameter, does it guarantee?

   tcpdump -i eth0 -w file.pcap -G 60

In both case, throughput is apprx 1Gbit