2TB 3 partition bootable MBR to 3 partition bootable GPT 4TB drive

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  1. Posts : 7,381
    Windows 7 HP 64
       #41

    Ok. Need more info

    Open a CMD window as administrator and type:

    diskpart
    list disk (it will list all drives. Identify the 4T drive number (should be 1)
    select disk n (replace n by the 4T drive number obtained with list disk)
    list part
    Exit
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  2. Posts : 128
    Win7 x64
    Thread Starter
       #42

    Exactly what info are you looking for?
    Is the above process going to change anything to the drive, or is it just to provide certain info? I'm not booting to that drive when I'm using any basic programs (i.e. Browser), I use the Main SSD drive partition.
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  3. Posts : 7,381
    Windows 7 HP 64
       #43

    Doesn't change anything. It just to provide certain info
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  4. Posts : 128
    Win7 x64
    Thread Starter
       #44

    There are 2 4TB drives one lists 0 free space, the other shows 3072kb free space

    Disk 1 is now the selected disk.
    DISKPART> list part
    Partition ### Type Size Offset
    ------------- ---------------- ------- -------
    Partition 1 Primary 30 GB 1024 KB
    Partition 2 System 101 MB 30 GB
    Partition 3 Primary 525 GB 30 GB
    Partition 4 Primary 3169 GB 556 GB


    Disk 2 is now the selected disk.
    DISKPART> list part
    Partition ### Type Size Offset
    ------------- ---------------- ------- -------
    Partition 1 Primary 2504 GB 17 KB
    Partition 2 Primary 1221 GB 2504 GB
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  5. Posts : 7,381
    Windows 7 HP 64
       #45

    The commands your friend should look
    Booting from disk 0 (SSD)
    On a CMD window as administrator type:

    diskpart
    select disk 1
    select part 2
    del part override
    create part EFI
    format fs=FAT32 quick
    assign letter=s
    exit
    bcdboot D:\Windows /s S:
    exit
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  6. Posts : 128
    Win7 x64
    Thread Starter
       #46

    I will pass that along, I haven't heard from him in a couple of days, so I'll see what he says.
    To expand my knowledge what are or what do these terms do;
    override
    "=s"
    "/s S:"
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  7. Posts : 16,257
    7 X64
       #47

    override is to delete a special partition
    delete partition | Microsoft Learn


    assign letter=s
    assign | Microsoft Learn


    tells it to assign letter s to the partition. Without letter=s it would just assign the next available letter

    /s S:

    BCDBoot Command-Line Options | Microsoft Learn

    is to specify the destination for the bcdboot command. Without the /s switch it would use the current system partition as the destination.

    2TB 3 partition bootable MBR to 3 partition bootable GPT 4TB drive-bcdboot-win7.jpg

    windows 11 bcdboot has additional switches

    2TB 3 partition bootable MBR to 3 partition bootable GPT 4TB drive-bcdboot-win11.jpg
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  8. Posts : 128
    Win7 x64
    Thread Starter
       #48

    Way over and past my pay grade (I know my limitations).
    Out of curiosity, if I were to assign 'S' to a drive, would it 'take' or get rejected right off the bat.
      My Computers


  9. Posts : 128
    Win7 x64
    Thread Starter
       #49

    Megahertz07 said:
    diskpart
    select disk 1
    select part 2
    del part override
    create part EFI
    format fs=FAT32 quick
    assign letter=s
    exit
    bcdboot D:\Windows /s S:
    exit
    Ok, we ran the commands and it fixed Win Boot Mgr box popping up. The Main SSD drive boots into W7 ok again, no pressing Esc.

    BUT,

    The new 4TB EFI drive wont boot. If I choose it at Boot time, the MB still goes to the SSD. WE thought it might be a MB issue inspite of the boards "Duo Boot" across (the top of the screen in the Bios).

    Then,
    I removed every drive but the new EFI TB and that drive doesn't boot at all. The script fixed the one problem but this one took it's place.
      My Computers


  10. Posts : 7,381
    Windows 7 HP 64
       #50

    videobruce said:
    Ok, we ran the commands and it fixed Win Boot Mgr box popping up. The Main SSD drive boots into W7 ok again, no pressing Esc.

    BUT,

    The new 4TB EFI drive wont boot. If I choose it at Boot time, the MB still goes to the SSD. WE thought it might be a MB issue inspite of the boards "Duo Boot" across (the top of the screen in the Bios).

    Then,
    I removed every drive but the new EFI TB and that drive doesn't boot at all. The script fixed the one problem but this one took it's place.
    The commands are different if you boot from the SSD or the 4T HDD

    If you Booted from disk 0 (SSD), you probably run the command
    bcdboot C:\Windows /s S: instead of bcdboot D:\Windows /s S:

    or
    You booted from the 4T HDD and not from the SSD


    Do it again

    Boot from disk 0 (SSD)
    On a CMD window as administrator type:

    diskpart
    select disk 1
    select part 2
    del part override
    create part EFI
    format fs=FAT32 quick
    assign letter=s
    exit
    bcdboot D:\Windows /s S:
    exit
      My Computers


 
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