![]() Thus a quick firmware or driver update can bump up the revision number because some of those features were already supported by the silicon. Newer specs often adopt and standardize features that already existed as proprietary extensions to the previous version. There was still only a single SSD controller located in the T2 chip on the logic board. Apple decided to put the NAND flash packages for the iMac Pro on a pair of removable modules, however they were in no way independent drives. RAID 0 in particular ditches the redundant bit and stripes across an array of independent drives purely for increased performance. This is a different concept than RAID though, which employs Redundant Arrays of Independent Drives to increase availability and in some cases performance. ![]() It is also likely that the drive can tolerate the failure of individual blocks and pages, or perhaps even whole NAND dies by using parity data. Both the T2 and the NAND flash packages are soldered directly to the logic board. Like most SSD controllers, it uses multiple channels (maybe 8 in this case?) to address the NAND flash dies and increase performance through parallelism. To elaborate on what Dan said, the T2 chip includes Appleās own NVMe PCIe SSD controller, which they developed in house.
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