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I had three hard drives installed in my computer. Two SSD and one HDD. They all worked fine. Today I tried to install a fourth hard drive, an NVMe drive. After installing the NVMe drive, the BIOS detected the NVMe drive, however it no longer detected my HDD. So I uninstalled the NVMe drive and my BIOS suddenly was able to detect my HDD drive again.

Motherboard: MSI Z97 Gaming 5

NVMe Drive: Crucial P1 SN: 2012E295D82B

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    Make sure you check which SATA ports and PCIe slots are active when specific configurations are used
    – Ramhound
    Apr 4, 2020 at 23:22

1 Answer 1

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Your motherboard's manual says:

* The SATA5 and SATA6 ports will be unavailable when installing a module in the M.2 port.

Various forums say that the Intel Z97 chipset uses the same PCIe lanes for both the external M.2 slot and the internal SATA controller providing SATA5/6 ports, so only one of them can be online at the same time.

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