For larger recordings, You’ll gain more disk I/O by disabling Spotlight.
the Spotlight indexing has a substantial negative effect on disk write throughput. So, either disable Spotlight entirely, or add the Record drive (or even folder) into the Spotlight privacy list so that Spotlight does not try to index while you are recording….
Another good tip is to disable Time-Machine. Don’t let time-machine monitor your record drive, or schedule backups during that time.