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  1. #11
    ROG Member Array ricemanhk PC Specs
    ricemanhk PC Specs
    MotherboardAsus ROG Maximus VIII Hero Alpha
    ProcessorIntel i7-6700k @ 4.6GHz
    Memory (part number)Corsair LPX 16GB 2400MHz
    Graphics Card #1MSI GTX 1070 Gaming X 8G
    Storage #1Samsung 950 Pro 256GB M.2 PCIe x4
    Storage #2WD Blue 3TB
    CPU CoolerCorsair H100i v2
    CaseCorsair Carbide 400C
    Power SupplyEVGA Supernova 850W B2
    OS Windows 10

    Join Date
    Sep 2016

    Quote Originally Posted by Jones0610 View Post
    The REAL fix would be to get a clean, formatted external HDD and copy over the files that you want to save from the current external HDD. I suspect, as ricemanhk said, that when you copied the files onto the external HDD it already had a bootloader or fragments of a bootblock on it. If it were me, in the interest of speed and effecting a permanent fix, this is the approach I'd take.
    Just to add to that, remember to delete ALL partitions on the external HDD, even the main one. Then create a new partition spanning the whole volume and give it a quick format. That's the only way to ensure no hidden partitions exist.

    Also when you look in disk management, right click the partitions and select properties. There you can see the partition style MBR or GPT.

    In your BIOS boot tab, is CSM disabled? That could also force the board into UEFI mode only.

  2. #12
    New ROGer Array
    Join Date
    Jul 2019

    Sorry to jack this very old thread but I've just spent hours trying to rectify the exact same problem and surprisingly there wasn't very much detailed info on how to fix this issue, aside from people saying to unplug the external HDD prior to boot and then plugging it back in, which is tedious and not very ideal.

    I just bought the 10GB Seagate External Backup Plus Hub (with the 7200rpm Barracuda Pro inside ) and my PC refuses to boot with this connected via USB and I've tried basically everything mentioned earlier and could not get it to POST/boot. I'm running a Strix Z390-E with a Samsung 970 Pro 512GB NVMe as my boot/system drive for reference.

    The ONLY workaround I've found that completely eliminates the problem in the meantime is to go into the Boot Configuration section inside your UEFI bios settings and find the option for something along the lines of GPT/MBR recovery policy and set that to Auto Recovery. It will then (hopefully) boot again normally every single time again like mine now does.

    Hope this helps.

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