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Apple Silicon Macs will introduce a new system for accessing macOS recovery and security options at startup, Apple explained at a WWDC session on Wednesday.

In the new system architecture, users can hold down the power button on their Mac to access the new startup screen, which features recovery options for reinstalling macOS, as well as options to boot as normal, shut down, and restart.

Apple is also replacing Target Disk Mode, which is used to transfer data between two Macs, with what's called Mac Sharing Mode. Mac Sharing Mode turns the system into an SMB file sharing server, providing another Mac with file-level access to user data. User authentication is required to access the service.

Meanwhile, Reduced security mode provides more flexibility by allowing users to disable System Integrity Protection and run any version of macOS, including those that are no longer signed by Apple.

Lastly, Apple Silicon Macs run separate security policies for each OS installation, whereas Intel-based Macs operate on a less flexible system-wide security policy. For more details on this and the other new startup features, check out the full WWDC session on the Apple developer website.

Excerpt from:
Apple Silicon Macs to Feature New Boot and Recovery Interface, New Mac Sharing Mode Replacing Target... - MacRumors