2023-06-22 19:17:27
Every time Apple releases a new Mac, a concern arises: the capacity of the SSD and its speed. While looking for information on how Apple manages its SSDs, we came across an interesting problem: in Intel Macs that integrate a T2 chip, there are two versions of the latter, which differ in the amount of RAM. And this difference prevents the update of the SSD, even for (very) motivated hackers.
A RAM problem
In Intel Macs equipped with a T2 chip – which becomes (almost) a requirement for macOS Sonoma – the chip in question manages a lot of things. It is a system on chip equivalent to the A10 of the iPhone 7 and the T2 supports storage in particular. Indeed, it serves as a controller for the Mac’s storage and interfaces in PCI-Express on one side with the Intel CPU chipset and on the other with Apple’s proprietary NAND memory chips.
macOS Sonoma: even more limited Mac compatibility than for Ventura
In practice, Apple has offered a capacity that varies from 128 GB to 8 TB on Macs equipped with a T2 chip… and there are two variants of this. The former is installed in Macs with up to 512 GB of storage, the latter in Macs with at least 1 TB of storage space. The difference ? The amount of RAM associated with the system on chip: 1 GB in the first case, 2 GB in the second. Part of this RAM is used for the NVMe controller, which manages the storage.
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