bootrec /scanos and /rebuildbcd finds 0 windows installations normal?


  1. yesir360
    Posts : 135
    Windows 10
       New #1

    bootrec /scanos and /rebuildbcd finds 0 windows installations normal?


    Is it normal for bootrec /scanos and bootrec /rebuildbcd to find 0 windows installations? From what I've gathered by searching online, it's quite not normal, but it also seems to be only for legacy BIOS. I'm using UEFI and can boot into windows fine, but bootrec still only shows 0 windows installations. Just confirming here. Windows version is Windows 10, 2004

    (As a side question, UEFI always puts the boot and bcd files in it's own partition while BIOS places it in C:/boot right?)
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  3. Megahertz
    Posts : 6,320
    Windows 11 Pro - Windows 7 HP - Lubuntu
       New #2

    Please edit your profile with ALL your hardware specs. It will help us to help you.
    System Specs - Fill in at Ten Forums

    Do you have a laptop or desktop? How many drives you have?

    Yes, UEFI always puts the boot and bcd files in EFI Fat32 partition.
    On Legacy computers you may have boot and bcd files on a System partition or in C:/boot.
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  4. yesir360
    Posts : 135
    Windows 10
    Thread Starter
       New #3

    It's just one drive that has the EFI partition and everything else.
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  6. spunk
    Posts : 4,798
    Windows 11 Pro 64 Bit 22H2
       New #4

    If you are booting from a Windows 10 Boot Disk and then running the commands from the Command Prompt in the Recovery Environment, that loads a Virtual Drive X:\sources.
    To run the ScanOS command, you have to type the drive letter that Windows is in. The Drive letter for Windows may change when in the RE.
    At command prompt (x:\sources) type this exactly as written:
    bcdedit |find “osdevice” (Must inc ” and the |), the | before Find is the Upper case \ key) press enter. This will tell you what drive letter the OS is on. It may not be on the C: drive.
    Once you type the correct Drive letter in and press Enter, if you now type in the command, it should tell you number of Windows installations.
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  7. Megahertz
    Posts : 6,320
    Windows 11 Pro - Windows 7 HP - Lubuntu
       New #5

    Please edit your profile with ALL your hardware specs. It will help us to help you.
    System Specs - Fill in at Ten Forums

    Do you have a laptop or desktop? How many drives you have?

    Please post a disk manager image
    How to Post a Screenshot of Disk Management
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  8. yesir360
    Posts : 135
    Windows 10
    Thread Starter
       New #6

    spunk said:
    If you are booting from a Windows 10 Boot Disk and then running the commands from the Command Prompt in the Recovery Environment, that loads a Virtual Drive X:\sources.
    To run the ScanOS command, you have to type the drive letter that Windows is in. The Drive letter for Windows may change when in the RE.
    At command prompt (x:\sources) type this exactly as written:
    bcdedit |find “osdevice” (Must inc ” and the |), the | before Find is the Upper case \ key) press enter. This will tell you what drive letter the OS is on. It may not be on the C: drive.
    Once you type the correct Drive letter in and press Enter, if you now type in the command, it should tell you number of Windows installations.
    Yes, I only have the C: drive, am on the C: drive, and am using the command on it. It still says 0 windows installations found. Even though I can boot to the desktop fine. Supposedly this is normal...
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  9. spunk
    Posts : 4,798
    Windows 11 Pro 64 Bit 22H2
       New #7

    ScanOS only works in the RE. In other words, you have to boot from a Windows installer USB Flash Drive or DVD.
    In the RE, the drive that has C: on it also has a small hidden partition called System Information, this drive which doesn't have a drive letter in Windows, but many times take on the drive letter C: in the RE: and push the Windows C: drive to the letter D:
    When you boot off of the installer and go to the Command Prompt, the drive letter in the Virtual drive is drive X: To run the commands, you have to type the Windows drive letter in and press Enter, then run the commands.
    Please upload a photo of the command prompt where you are typing this command.
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  10. yesir360
    Posts : 135
    Windows 10
    Thread Starter
       New #8

    So I've already fixed the boot issue. Seems like a combination of the other bootrec functions and bootsect fixed it.

    /scanos and /rebuildbcd still finds 0 installations which is weird but it works I suppose. It also finds 0 installations on some of my other devices so idk. Guess I'll ignore it for now since it works
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