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I have an M.2 AHCI PCIe SSD and I am considering purchasing a second one to install both in a 2009 Mac Pro in a RAID 0 configuration using Disk Utility similar to the setup in this video.

I have used my current M.2 AHCI PCIe SSD in the past as a single bootable drive into macOS Sierra, but want to increase performance and storage by setting these up in a bootable RAID 0 config.

My primary concern is that macOS sees these SSDs as external, so I'm concerned that even though I can boot from one AHCI PCIe SSD there might be problems booting from two in a RAID 0 config, or I might not be able to create a RAID 0 config in Recovery tools at all.

Is what I want to do possible?

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