Burden: About 5 minutes, depending on size of drive. Before You Begin Considering using a high-endurance drive for Sentry Mode, because of the many writes this feature performs. Do an online search for “high endurance drive”. Regardless of the drive you use, everything on it will be removed once you’re done with this tutorial. 1… Continue reading Partition a Single Mac OS Extended (Journaled) Drive into 2 Partitions for Sentry Mode and Audio on Model 3