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@Peter Gamble, probably a special controller on those things, because they didn’t find a controller for the SSD’s on the logic board.
“Conspicuously absent here is any sign of an SSD controller. More on that in a minute. “
“ The successor to the T1 chip introduced in 2016's MacBook Pro with Touch Bar, the T2 is tasked here with all the functions of the SMC, image signal processing for the camera, audio control, and SSD controller, and Secure Enclave, and a hardware encryption engine. Whew! “
Meaning that the T1 is controlling how the SSD’s send and receive data and the SSD’s are designed to work with the T1. Mind you that the T1 is an arm based co processor (if I’m not mistaken). They’ll probably do some testing but I would bet that they are not being controlled by an AHCI spec.