Not picking up second M2 in windows.

Discussion in 'SSD and HDD storage' started by Dave61, Feb 21, 2021.

  1. Dave61

    Dave61 New Member

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    I have a Z270 Extreme 4 P2.20 motherboard.
    When I go to the UEFI, it tels me there are 2 M2 drives.
    M2-1 is a Samsung 250Gb M2
    M2-2 is a Corsair MP600 1Tb M2

    I have 4 hard disks,
    500Gb SSD
    2x 1Tb and 1 1Tb standard Sata.
    These are plugged into a1, a2, 2, 3
    This leaves 0,1, 4, 5 as the M2 slots as shown in the M2 sata switch option..

    All of these show up in the UEFI
    When I got to Windows 7, there is no sign of the Corsair M2 drive in M2-2.

    Can someone give me any idea of why this should be?
     
    Last edited: Feb 21, 2021
  2. The Goose

    The Goose Ancient Guru

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    Have you tried just your m.2 drives pugged in, also is the second drive formatted as a uefi drive or has it previously been used as a standard bios boot drive, does it show in disk management.
     
    Last edited: Feb 21, 2021
  3. Dave61

    Dave61 New Member

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    I was formatted as a data drive on an external USB M2 adapter since, neither the motherboard nor the drive, came with a screw to hold it in place. Does it have to be pre-formatted with a special format?

    I have tried scan for hardware changes in hardware management and rescan disks in computer management but it doesn't even show up as an unformatted drive with no drive letter.
     
  4. Agonist

    Agonist Ancient Guru

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    Does it show up in disk management?
    You may need to format in disk management or assign a drive letter to it.
     

  5. Dave61

    Dave61 New Member

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    Not showing up anywhere except in the BIOS.
    In Windows, it's like the drive doesn't exist at all. not in disk management or device manager in disk drives. All that show are the original M2 and the 4 other hard disks I have.

    I know it works because when I put it in thte USB adapter, it works perfectly. AND Windows sees it.
     
  6. Astyanax

    Astyanax Ancient Guru

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    have you got an ancient version of acronis installed, particularly a wd version?

    there was a volume filter in one of them that would delay if not block the mounting of certain flash drives above a particular size.
     
  7. Passus

    Passus Ancient Guru

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    Does it show if you unplug all the other drives?

    i mean just both m2 drives connected
     
  8. Dave61

    Dave61 New Member

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    Don't even know what Acronis is. the only HD management software on my PC is the safely remove hardware app in the system bar.

    Not sure I can do it, Windows has some stuff installed on other drives so it might crash Windows if I tried.

    I'll have a go though.

    Edit: No it didn't crash but the second M2 still isn't showing up.
     
    Last edited: Feb 21, 2021
  9. Caesar

    Caesar Maha Guru

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    Page 22 of your motherboard manual.

    * M2_1, SATA3_0 and
    SATA3_1 share lanes. If
    either one of them is in
    use, the others will be
    disabled.
    * M2_2, SATA3_4 and
    SATA3_5 share lanes. If
    either one of them is in
    use, the others will be
    disabled.
     

    Attached Files:

  10. Dave61

    Dave61 New Member

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    0,1,4,5 are all empty. Right at this moment, the ONLY two drives plugged in are the two M2 drives. as I disconnected the other HDD sata plugs to see if there was a conflict.
     

  11. Dave61

    Dave61 New Member

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    0,1,4,5 are all empty. Right at this moment, the ONLY two drives are the two M2 drives as I unplugged the Sata leads to see if there was a conflict.
     
  12. Scorpio_ASC

    Scorpio_ASC Member

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    my mobo wouldnt let me use the second m2 slot while my second large PCI slot, the one under where you would normally place the gpu, were occupied.
     
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  13. suty455

    suty455 Master Guru

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    not had Intel since the year dot but on AMD 400 and below series it would do the same as the pcie and m2 shared the same lanes you could use one or the other but not both
     
  14. patteSatan

    patteSatan Member Guru

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    Try updating the BIOS on the motherboard, it might help, it sometimes helps, sometimes not.
    Oh, and you can try clearing CMOS.
     
  15. Dave61

    Dave61 New Member

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    I finally found it. A nightmare trying to get it but it was a hotfix from MS that was no longer on the MS site. I had to do some searching to find it as the links from the MS site went nowhere.
    Nvme hotfix. Apparently it allows you to see M2 drives in Win 7 Pro. Not sure why though, it sees my original M2 boot drive perfectly, so it should have seen the second one too in my view.

    Both my M2 drives are now visible and I can access the second one properly.

    Why must MS be such a PITA with older versions of Windows? I get they don't support them now, but keeping a vital hotfix that takes only 6Mb on their site as an archive wouldn't take much, it's not like they are hard up for cash and can't afford the storage space for them.
     

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