X370 Taichi M2_2 doesn't detect disk

I have the X370 Taichi and in M2_1, the Ultra M.2 slot I have the Samsung 960 EVO which detects fine and is my boot drive. I purchased a Crucial MX300 1TB M.2 (2280) Internal Solid State Drive (CT1050MX300SSD4) and it arrived today. When I put it in my M2_2 it doesn't detect disk at all. If I put it in M2_1 slot it doesn't detect. However, if I put it in my older Intel rig, it detects fine. Is this drive not compatible with this motherboard?< ="chrome-extension://hhojmcideegachlhfgfdhailpfhgknjm/web_accessible_resources/index.js">

twf85 wrote: I don't believe your board supports an mSATA drive in the M.2_2 port. Needs to be a PCIe SSD. The only way to get BOTH of those drives running in your system would be to reverse their installation locations. You'll take a performance hit on the 960, but given the size of the Crucial drive, it may be worth it to you. A 1TB PCIe SSD is considerably more expensive than what you have now.

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twf85 wrote: Not sure if I'd fork over cash for a drive with TLC memory, but it should function :)

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makaron wrote: Hello, I have the same problem. The Samsung 960 pro work fine on slot 1. The MX 300 M.2 1TB is not detected by BIOS when is placed on slot 2.  Any advice?  Thanks Tsvetomir

Assuming you have the X370 Taichi board. From your board's specifications:

1 x Ultra M.2 Socket (M2_1), supports M Key type 2242/2260/2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x4 (32 Gb/s)

1 x M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280 M.2 PCI Express module up to Gen2 x4 (20 Gb/s)

 The M2_2 slot on this board does not support SATA M.2 SSDs. The M2_1 slot does support SATA M.2 SSDs, but the M2_2 slot is only PCIe 2.0 x4, instead of PCIe 3.0 x4, so a 960 Pro would not perform at its full potential in that slot.

Given the multiple types of M.2 SSDs (NVMe, AHCI, SATA), the limited resources provided by the processor (PCIe lanes) and chipset (SATA resources and PCIe lanes), and how the resources have been allocated in the design of a board, we must be very careful to check the specs of the M.2 slots when we consider using various M.2 SSDs.

ASRock has a table on the page below with the M.2 slot specs for their Ryzen boards. If support for something is not specifically stated, do not assume it is supported. There are other FAQ entries on this page:

http://www.asrock.com/microsite/AM4TSD/