The KaVA observations are basically limited to record with 1024 Mbps data rate. To response 1 Gbps recording, VERA and KVN have OCTADISK and Mark5B recording systems, respectively. OCTADISK and Mark5B are hard disk recording systems developed at NAOJ and Haystack observatory, respectively. A high-speed magnetic tape recorder, DIR-2000, is no longer used. Their total bandwidths are 256 MHz because of 2-bit sampling.