Changes between Version 1 and Version 2 of Correct BCD Boot Records


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Timestamp:
04/23/23 15:25:08 (19 months ago)
Author:
Paul Kulda
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  • Correct BCD Boot Records

    v1 v2  
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    20  * Best Way to Fix “MBR2GPT Cannot Find OS Partition” in Windows 10
    21 
    22 
    23 = Best Way to Fix “MBR2GPT Cannot Find OS Partition” in Windows 10 =
    24 Generally, you can convert boot disk from MBR to GPT via the MBR2GPT.exe  tool. However, sometimes, you might meet the “MBR2GPT cannot find OS  partition” error message. Don't worry, here we list the workable  solution.
    25 
    26 By [https://www.diskpart.com/author/emily.html Emily]  / Last Updated December 22, 2022
    27 
    28 
    29  * [https://www.diskpart.com/gpt-mbr/mbr2gpt-cannot-find-os-partition-7201.html#1 MBR2GPT Cannot find OS Partition for Disk 0?]
    30  * [https://www.diskpart.com/gpt-mbr/mbr2gpt-cannot-find-os-partition-7201.html#2 Why MBR2GPT cannot find OS partiiton and how to solve it?]
    31  * [https://www.diskpart.com/gpt-mbr/mbr2gpt-cannot-find-os-partition-7201.html#3 Best way to evade “MBR2GPT cannot find OS partition” issue]
    32  * [https://www.diskpart.com/gpt-mbr/mbr2gpt-cannot-find-os-partition-7201.html#4 Summary]
    33 
    34 
    35 == MBR2GPT Cannot find OS Partition for Disk 0? == #toc.0.8856601936172211
    36 Hi, experts, when i  trying to convert my Win10 boot disk from MBR to GPT partition table,   it keeps failing with the "Cannot find OS Partition(s) for disk 0". I  have read many articles but nobody offered a clear solution for  this. Anyone can help me out? Thanks a lot!
    37 
    38 MBR2GPT.EXE is a tool to help users convert an operating system disk  from the MBR to GPT partition style without modifying or deleting any  data on the boot disk. You can run it from a Windows Preinstallation  Environment (Windows PE) command prompt, or from the full Windows 10  operating system (OS) by using the /allowFullOS option. It is available  and located in the Windows\System32 directory on a computer running  Windows 10 version 1703 or later.
    39 
    40 To convert a system disk with earlier versions of Windows such as Windows 7, 8, or 8.1, you have to [https://www.diskpart.com/articles/upgrade-windows7-or-8-to-windows-10-4348.html upgrade the operating system to Windows 10] first, then perform the MBR to GPT conversion. In particular, Microsoft declared that '''Windows 11 requires supporting UEFI '''if users plan to upgrade their Windows 10 to Windows 11 through the "Check for Update" feature. Thus, [https://www.diskpart.com/gpt-mbr/convert-mbr-to-gpt-without-data-loss.html converting their MBR disk to GPT] is also necessary.
    41 
    42 
    43 == Why MBR2GPT cannot find OS partition for disk 0 and how to solve it? == #toc.0.16234783437202194
    44 In general, you can use the MBR2GPT command line tool to convert your  system disk from MBR to GPT. After this is done, you can boot Windows  in modern UEFI mode rather than the old BIOS Legacy mode, and you can  make the fullest use of 2TB+ hard drive. However, sometimes, it does not  work and prompts the error message saying "Cannot find OS partition for  disk 0". There could be many reasons behind this MBR2GPT conversion  failure. One of the most important reasons might be the bad entries in  the Boot Configuration data. To solve it, you can refer to the  subsequent steps:
    45 
    46 '''Step 1.''' Make use of [https://www.diskpart.com/windows-10/diskpart-windows-10-1203.html diskpart] and run the following commands to find out the OS partition and the system reserved partition and assign them a drive letter.
    47 
    48 '''▸diskpart'''
    49 
    50 '''▸select disk 0''': the operating system disk
    51 
    52 '''▸list partition'''
    53 
    54 '''▸select partition 2''': the partition where the Windows OS is installed
    55 
    56 '''▸assign drive letter= w '''(or other available drive letter)
    57 
    58 '''▸select partition 1''': the system reserved partition
    59 
    60 '''▸assign drive letter= b '''(or other available drive letter)
    61 
    62 '''▸exit''': exit the diskpart.exe
    63 
    64 '''Step 2. '''Run the command “'''X: \Sources>dir /a w: \ '''“to  take a further look into the Windows system partition to check whether  there are the boot folder inside. If there is not required boot folders,  then run the command “'''X: \Sources>dir /a b: \'''” to check the system reserved partition.
    65 
    66 '''Step 3.''' After you find the boot folder in either system partition or system reserved partition, you need to run the “'''X: \Sources>dir /a b: \Boot'''” to invoke the bcdedit tool and point it to the boot configuration data store that you have found.
    67 
    68 '''Step 4. '''Look out the invalid entries now. Run the  command: “X: \Sources>bcdedit /store B:\boot\bcd /enum all”. There  are many hints for bad or invalid entries. For example, you might find  “unknown” in some entry. They can be the remnant of a previous Windows  installation or caused by some vicious software.
    69 
    70 '''Step 5. '''Copy the identifier of the bad entry. Then,  point bcdedit to the store again and ask it to delete the bad entry  using the copied identifier.
    71 
    72 '''Step 6. '''Then you can try to run the “X:  \Sources>bcdedit /store  B:\boot\bcd /enum all” command again to  check whether all are OK now.
    73 
    74 When everything goes well, try the MBR2GPT tool again. You can make it done successfully this time.
    75 
    76 
    77 == Best way to evade "MBR2GPT cannot find OS partition" issue == #toc.0.7132993181202598
    78 Refer to the above solution and you can solve the “cannot find os  partitions for disk 0” in MBR2GPT.exe tool. However, it is too  complicatd and difficult to follow for most users. So, here we would  like to share an easier tool to help you finish the MBR and GPT  conversion. That is [https://www.diskpart.com/partition-manager-pro-edition.html AOMEI Partition Assistant Professional]. Compared with MBR2GPT, it owns the following advantages:
    79 
    80 
    81  Finish the MBR to GPT conversion on an intuitive interface, easy to follow for both experts and newbies;
    82  Be able to work well on all editions of Windows 11/10/8/7 and Windows XP/Vista (32-bit and 64-bit);
    83  Support converting both system disk and non-system disk to from MBR  to GPT partition styles without deleting any data on the disk.
    84  Besides converting disk from MBR to GPT, it can also convert any disk from GPT to MBR, likewise, without modifying disk data.
    85 
    86 Now, you can download its demo version for a free trial or simulation.
    87 
    88 [https://www.diskpart.com/ss/download/pa/PAssist_ProDemo.exe Try Demo Win 11/10/8.1/8/7/XP]Secure Download
    89  Notes:✎...:: After the boot disk has been converted to GPT partition style, the firmware must be reconfigured from [https://www.diskpart.com/gpt-mbr/change-legacy-to-uefi-4348i.html Legacy BIOS to UEFI].
    90  Make sure that your device supports UEFI before attempting to convert the system disk.
    91 
    92 Step 1. Install and run AOMEI Partition Assistant Professional. Right-click the system disk and choose “Convert to GPT Disk”.
    93 
    94 Step 2. In the next window, click “OK” to confirm your operation.
    95 
    96 Step 3. Back to the main interface, click on “Apply” to commit the pending operation.
    97 
    98 If you want to [https://www.diskpart.com/articles/how-to-convert-gpt-to-mbr-without-operating-system-4125.html convert MBR or GPT without loading operating system], you can first use this software to create a bootabale media, then boot computer from it and finish the conversion.
    99 
    100 
    101 == Summary == #toc.0.1527660838318773
    102 This page tells how to solve “MBR2GPT cannot find OS partition” on  Windows 10. Besides, we also introduce another tool to help you easily  get around such issues. The AOMEI Partition Assistant Professional also  comes with many other functions: [https://www.diskpart.com/clone/clone-mbr-to-gpt-ssd-0310.html clone MBR disk to GPT disk],  or GPT disk to MBR disk, clone partition, transfer OS between MBR and  GPT disk, convert dynamic disk to basic disk without deleting volumes,  and more. If you are running Windows Server, please switch to the [https://www.diskpart.com/partition-manager-server-edition.html Server edition].
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    115  You May Also Like:: [https://www.diskpart.com/windows-10/mbr2gpt-conversion-failed-3889.html Analysis on MBR2GPT Conversion Failed and How to Fix It in Windows 10]
    116  [https://www.diskpart.com/articles/mbr2gpt-error-4125.html How to Fix MBR2GPT Error in MBR to GPT Conversion in Windows 10?]
    117  [https://www.diskpart.com/gpt-mbr/mbr2gpt-validation-failed-8523.html Quick Fixes to MBR2GPT Validation Failed]
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