Since then we’ve been given separate but firmlinked System and Data volumes, and in Apple silicon Macs two extra hidden containers. If you want to go the whole hog, then on Apple silicon Macs you can also install a fresh set of firmware. Data volume aloneProvided your Mac has a T2 or Apple silicon chip, destroying the current data volume is both quick and simple using EACAS. Once that has completed, the procedure differs according to whether this is an Intel or Apple silicon model. Apple recommends a slightly different procedure for Apple silicon Macs, where you should be invited to Erase and Restart.