Asus Laptop Replaced SSD Cant Boot Windows After Install

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  1. essenbe's Avatar
    Posts : 12,507
    Windows 10 Pro 1903
       #11

    Some run off of PCIe lanes and some run off of the sata bus. I just had to find a sata based M.2 for my Wife's Asus laptop.
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  2. Posts : 69
    Duh Windows 9
    Thread Starter
       #12

    Oh k, if my drive is nvme then i have no idea why its not being shown in the bios then, its the same size too
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  3. essenbe's Avatar
    Posts : 12,507
    Windows 10 Pro 1903
       #13

    Have you tried what NavyLCDR showed in Post #7?
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  4. NavyLCDR's Avatar
    Posts : 15,492
    Windows 10 Pro
       #14

    xboxhaxorz said:
    Oh k, if my drive is nvme then i have no idea why its not being shown in the bios then, its the same size too
    Your bios does not support NVMe. Windows 10 does have support for NVMe. It's like running Windows 10 on a legacy bios computer with a second hard drive that is GPT partitioned. The legacy BIOS itself cannot see the GPT partitions, therefore cannot boot from a GPT partitioned drive, but once Windows loads, then the drive is accessible using the Windows driver.

    The original SSD is not NVMe - it is shown as having MLC - Multi Level Cell NAND. I believe, but I am entirely 100% certain, that this is the same as 3D NAND:
    Intel 660p Series M.2 2280 512GB PCI-Express 3.0 x4 3D NAND Internal Solid State Drive SSDPEKNW512G8XT - Newegg.com

    And that's the reason you can't boot Windows from the NVMe SSD. Maybe there is a UEFI firmware upgrade for the laptop that supports NVMe?
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  5. bobkn's Avatar
    Posts : 3,601
    Win 10 X64 Pro 20H2 19042.685
       #15

    NavyLCDR said:
    Your bios does not support NVMe. Windows 10 does have support for NVMe. It's like running Windows 10 on a legacy bios computer with a second hard drive that is GPT partitioned. The legacy BIOS itself cannot see the GPT partitions, therefore cannot boot from a GPT partitioned drive, but once Windows loads, then the drive is accessible using the Windows driver.

    The original SSD is not NVMe - it is shown as having MLC - Multi Level Cell NAND. I believe, but I am entirely 100% certain, that this is the same as 3D NAND:
    Intel 660p Series M.2 2280 512GB PCI-Express 3.0 x4 3D NAND Internal Solid State Drive SSDPEKNW512G8XT - Newegg.com

    And that's the reason you can't boot Windows from the NVMe SSD. Maybe there is a UEFI firmware upgrade for the laptop that supports NVMe?
    I don't get it. The mzhpv512hdgl is supposed to be an SM951 drive. An SM951 drive is supposed to support NVME. (My memory is a bit hazy, but it may have been Samsung's first M.2 NVME drive for the desktop market.) Is either one of those false?
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  6. NavyLCDR's Avatar
    Posts : 15,492
    Windows 10 Pro
       #16

    bobkn said:
    I don't get it. The mzhpv512hdgl is supposed to be an SM951 drive. An SM951 drive is supposed to support NVME. (My memory is a bit hazy, but it may have been Samsung's first M.2 NVME drive for the desktop market.) Is either one of those false?
    According to this webpage:
    Samsung SM951 512GB (AHCI) specifications

    The SM951 came in two different versions. AHCI and NVMe. The original SSD was AHCI.
    Last edited by NavyLCDR; 25 Nov 2018 at 13:43.
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  7. bobkn's Avatar
    Posts : 3,601
    Win 10 X64 Pro 20H2 19042.685
       #17

    NavyLCDR said:
    According to this webpage:
    Samsung SM951 512GB (AHCI) specifications

    The SM951 came in two different versions. AHCI and NVMe. The original SSD was AHCI.
    Well, darn, that's confusing.

    I suppose that it's a natural consequence of the SM951 being one of the first consumer-level NVME M.2 drives on the market, nearly 4 years ago.

    I's too bad that Intel didn't design NVME to be backwards compatible with plain PCI-E.
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  8. Posts : 69
    Duh Windows 9
    Thread Starter
       #18

    NavyLCDR said:
    Your bios does not support NVMe. Windows 10 does have support for NVMe. It's like running Windows 10 on a legacy bios computer with a second hard drive that is GPT partitioned. The legacy BIOS itself cannot see the GPT partitions, therefore cannot boot from a GPT partitioned drive, but once Windows loads, then the drive is accessible using the Windows driver.

    The original SSD is not NVMe - it is shown as having MLC - Multi Level Cell NAND. I believe, but I am entirely 100% certain, that this is the same as 3D NAND:
    Intel 660p Series M.2 2280 512GB PCI-Express 3.0 x4 3D NAND Internal Solid State Drive SSDPEKNW512G8XT - Newegg.com

    And that's the reason you can't boot Windows from the NVMe SSD. Maybe there is a UEFI firmware upgrade for the laptop that supports NVMe?
    Ahh that does make sense, and it sucks lol

    That 970 pro is a beast too beastly for my machine

    I have contacted asus about it, perhaps they do have another firmware
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  9. NavyLCDR's Avatar
    Posts : 15,492
    Windows 10 Pro
       #19

    xboxhaxorz said:
    Ahh that does make sense, and it sucks lol

    That 970 pro is a beast too beastly for my machine

    I have contacted asus about it, perhaps they do have another firmware
    Read further down in the thread. I found out that your original SSD came in both AHCI and NVMe formats. The original SSD was AHCI which is all your EFI firmware recognizes. So, currently, you would have to replace it with a PCIe 3.0x4 AHCI SSD, not NVMe, if you wanted to boot from it.
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  10. bro67's Avatar
    Posts : 8,346
    Mac OS Catalina
       #20

    xboxhaxorz said:
    Ahh that does make sense, and it sucks lol

    That 970 pro is a beast too beastly for my machine

    I have contacted asus about it, perhaps they do have another firmware
    A firmware change is not going to do anything to fix the problem. The hard drive controller only knows what it was hardwired to do.
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