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Apple G3 iMac booted in Target Mode Target Disk Mode (sometimes referred to as TDM or Target Mode ) is a boot mode unique to Macintosh computers. When a Mac that supports Target Disk Mode [ 1 ] is started with the 'T' key held down, its operating system does not boot.
The PC 97 standard requires that a computer's BIOS must detect and work with USB HID class keyboards that are designed to be used during the boot process. Some keyboards implement the USB Boot Keyboard profile specified in the USB Device Class Definition for Human Interface Devices (HID) v1.11 and are explicitly configured to use the boot protocol.
For iPhones, iPads and Apple silicon-based Macs, the boot process starts by running the device's boot ROM. On iPhones and iPads with A9 or earlier A-series processors, the boot ROM loads the Low-Level Bootloader ( LLB ), which is the stage 1 bootloader and loads iBoot; on Macs and devices with A10 or later processors, the boot ROM loads iBoot.
The technology used is similar to ARM's TrustZone/SecurCore but contains proprietary code for Apple KF cores in general and SEP specifically. It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest. [citation needed] It has its own secure boot process to ensure that it is completely secure.
A storage controller for the computer's solid-state drive, including always on, on-the-fly encryption and decryption of data to and from it. [4] [9] [10] The T2 is integral in the boot sequence and upgrading of operating systems, not allowing unsigned components to interfere. [4] [8] [9] [10]
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Those Macintoshes include a ROM chip varying in sizes up to 4 megabytes (MB), [8] which contains both the computer code to boot the computer and to run the Mac OS operating system. The ROM-resident portion of the Mac OS is the Macintosh Toolbox and the boot-ROM part of that ROM was retroactively named Old World ROM upon the release of the New ...
In all instances, the startup chimes will be heard upon completion of the boot process (if successful), and a Happy Mac (or the Apple logo on newer versions) will be displayed on the screen to visually indicate that no hardware issues were found during the boot process. [3] [4] On the other hand, a failure to do so will result in a different ...