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Installing an M.2 SSD causes old HDD to become undetected. Removing the SSD fixes the problem. What to do?

Built a new PC. While waiting for my M.2 SSD (Intel 600p Series M.2 2280 SSD 512GB) to arrive in the mail, I decided to put my existing mechanical hard drive in my new build and just put Windows there in the meantime.

The SSD came in the mail today. I installed it on the motherboard, did a fresh install of Windows on it, it works fine. But suddenly, my old mechanical HDD is no longer detected. Not by Windows, not by disk management, nor by the BIOS. The BIOS now says that all the SATA ports are empty. I tried removing the SSD and suddenly, the old HDD is detected again and works just as before.

I have googled around but can't find anything. What is going on here and how can I fix it? I want to have Windows on the SSD and use the mechanical HDD as a secondary drive for other files. MOBO is set to AHCI.

Any help is appreciated.

MOBO: MSI Z170a Gaming M3

SSD: Intel 600p Series M.2 2280 SSD 512GB

HDD: Seagate Barracuda 1TB ST1000DM003
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    henket said:
    Built a new PC. While waiting for my M.2 SSD (Intel 600p Series M.2 2280 SSD 512GB) to arrive in the mail, I decided to put my existing mechanical hard drive in my new build and just put Windows there in the meantime.

    The SSD came in the mail today. I installed it on the motherboard, did a fresh install of Windows on it, it works fine. But suddenly, my old mechanical HDD is no longer detected. Not by Windows, not by disk management, nor by the BIOS. The BIOS now says that all the SATA ports are empty. I tried removing the SSD and suddenly, the old HDD is detected again and works just as before.

    I have googled around but can't find anything. What is going on here and how can I fix it? I want to have Windows on the SSD and use the mechanical HDD as a secondary drive for other files. MOBO is set to AHCI.

    Any help is appreciated.

    MOBO: MSI Z170a Gaming M3

    SSD: Intel 600p Series M.2 2280 SSD 512GB

    HDD: Seagate Barracuda 1TB ST1000DM003


    Which SATA port is the HDD connected to?
    Look on page 33 of your user manual (English)
    https://us.msi.com/Motherboard/support/Z170A-GAMING-M3.html#down-manual
    M.2/SATA & SATAe combination table

    If your m.2 is plugged into a SATA port, the SATA 1 & 2 are not available.
    If your m.2 is using a PCIe connection, SATA 3 & 4 are not available.
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