"old" M.2 System drive is MBR, cannot convert to GPT for W11 Upgrade

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  1. Posts : 5
    10
       #1

    "old" M.2 System drive is MBR, cannot convert to GPT for W11 Upgrade


    Hello all. I'm trying to get my system ready for the Windows 11 upgrade. Everything is set, and as you can see from my system stats, everything should be compatible. The only problem i'm having is setting my Boot type to GPT instead of MBR. I'd rather not reinstall all my software... it's a pain. I have other drives for storage, so this is purely an operating system and software drive. I've used the mbr2gpt.exe in both active mode and WindowsPE. In active mode, i get the error "cannot find room for the EFI system partition.". That issue leads me down many rabbit holes of which i cannot find a viable solution other than reformat/reinstall. When i try the mbr2gpt.exe under WindowsPE, i get the "Cannot install new boot files. Error: 0x000000C1" message. I only have 3 partitions on the drive (don't know why there are 3, as two are only necessary for Windows build 21H1 (though i'm about to update to 21H2 by the time anyone reads this). I cannot figure out what is going on. I've even pointed the converter to the specific partition on the specific disk to mitigate confusion and i get nothing. Below is the setupact.log of the last two attempts.

    Any help?
    2021-11-20 16:17:21, Info MBR2GPT was explicitly asked to run in full OS mode.
    2021-11-20 16:17:21, Info MBR2GPT: Attempting to convert disk 2
    2021-11-20 16:17:21, Info MBR2GPT: Retrieving layout of disk
    2021-11-20 16:17:21, Info MBR2GPT: Initial partition information
    2021-11-20 16:17:21, Info ===========================================================
    2021-11-20 16:17:21, Info Partition layout for disk: 2
    2021-11-20 16:17:21, Info Partition style : MBR
    2021-11-20 16:17:21, Info MBR signature: 2706945433
    2021-11-20 16:17:21, Info Number of partitions : 3
    2021-11-20 16:17:21, Info ===================PARTITION===============================
    2021-11-20 16:17:21, Info Number: 1
    2021-11-20 16:17:21, Info Type: 7
    2021-11-20 16:17:21, Info Boot: Yes
    2021-11-20 16:17:21, Info Recognized: Yes
    2021-11-20 16:17:21, Info Style: 0
    2021-11-20 16:17:21, Info Offset: 1048576
    2021-11-20 16:17:21, Info Length: 524288000
    2021-11-20 16:17:21, Info Volume: \\?\Volume{a158b599-0000-0000-0000-100000000000}\
    2021-11-20 16:17:21, Info Drive: None
    2021-11-20 16:17:21, Info NT Path: \Device\HardDisk2\Partition1
    2021-11-20 16:17:21, Info ===================PARTITION===============================
    2021-11-20 16:17:21, Info Number: 2
    2021-11-20 16:17:21, Info Type: 7
    2021-11-20 16:17:21, Info Boot: No
    2021-11-20 16:17:21, Info Recognized: Yes
    2021-11-20 16:17:21, Info Style: 0
    2021-11-20 16:17:21, Info Offset: 1599078400
    2021-11-20 16:17:21, Info Length: 250322111488
    2021-11-20 16:17:21, Info Volume: \\?\Volume{a158b599-0000-0000-0000-505f00000000}\
    2021-11-20 16:17:21, Info Drive: C:\
    2021-11-20 16:17:21, Info NT Path: \Device\HardDisk2\Partition2
    2021-11-20 16:17:21, Info ===================PARTITION===============================
    2021-11-20 16:17:21, Info Number: 3
    2021-11-20 16:17:21, Info Type: 39
    2021-11-20 16:17:21, Info Boot: No
    2021-11-20 16:17:21, Info Recognized: Yes
    2021-11-20 16:17:21, Info Style: 0
    2021-11-20 16:17:21, Info Offset: 255504416768
    2021-11-20 16:17:21, Info Length: 553648128
    2021-11-20 16:17:21, Info Volume: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:17:21, Info Drive: None
    2021-11-20 16:17:21, Info NT Path: \Device\HardDisk2\Partition3
    2021-11-20 16:17:21, Info ===========================================================
    2021-11-20 16:17:21, Info ESP partition size will be 104857600
    2021-11-20 16:17:21, Info MBR2GPT: Validating layout, disk sector size is: 512 bytes
    2021-11-20 16:17:21, Info BCD: Opening store. Flags: 0x0
    2021-11-20 16:17:21, Info BCD: Store path: "\??\GLOBALROOT\device\harddisk2\partition1\Boot\BCD"
    2021-11-20 16:17:21, Info BCD: Loaded hive at BCD00000000
    2021-11-20 16:17:21, Info BCD: Opening object {9dea862c-5cdd-4e70-acc1-f32b344d4795}
    2021-11-20 16:17:21, Info FindOSPartitions: Default boot entry: {9DAF0541-CAE6-11E9-9E70-AC43DCA04519}
    2021-11-20 16:17:21, Info BCD: Opening object {9daf0541-cae6-11e9-9e70-ac43dca04519}
    2021-11-20 16:17:21, Info VERBOSE: Device path: \Device\HarddiskVolume3
    2021-11-20 16:17:21, Info VERBOSE: Dos path: \\?\GLOBALROOT\Device\HarddiskVolume3
    2021-11-20 16:17:21, Info FindOSPartitions: Volume name for the default boot entry: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:17:21, Info BCD: BcdGetElementDataWithFlags: Failed to open key.Object: {9daf0541-cae6-11e9-9e70-ac43dca04519} Type: 14000008 Status: c0000034
    2021-11-20 16:17:21, Info FindOSPartitions: No Recovery sequence found.
    2021-11-20 16:17:21, Info FindOSPartitions: Default boot entry locale: en-US
    2021-11-20 16:17:21, Info Bitlocker protection for C:\ is either off or suspended.
    2021-11-20 16:17:21, Info Unique ID recap for volumes:
    2021-11-20 16:17:21, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-100000000000}
    2021-11-20 16:17:21, Info Unique ID size: 12
    2021-11-20 16:17:21, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-505f00000000}
    2021-11-20 16:17:21, Info Unique ID size: 12
    2021-11-20 16:17:21, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}
    2021-11-20 16:17:21, Info Unique ID size: 12
    2021-11-20 16:17:21, Info MBR2GPT: System partition cannot be removed in full OS mode, leaving it untouched.
    2021-11-20 16:17:21, Info MBR2GPT: Trying to shrink the OS partition
    2021-11-20 16:17:23, Warning MBR2GPT: Partition final size is: 553648128 (initial size was 553648128), cannot rely on this space
    2021-11-20 16:17:23, Error Cannot find room for the EFI system partition.
    2021-11-20 16:17:23, Info MBR2GPT: Partition information at error point
    2021-11-20 16:17:23, Info ===========================================================
    2021-11-20 16:17:23, Info Partition layout for disk: 2
    2021-11-20 16:17:23, Info Partition style : MBR
    2021-11-20 16:17:23, Info MBR signature: 2706945433
    2021-11-20 16:17:23, Info Number of partitions : 3
    2021-11-20 16:17:23, Info ===================PARTITION===============================
    2021-11-20 16:17:23, Info Number: 1
    2021-11-20 16:17:23, Info Type: 7
    2021-11-20 16:17:23, Info Boot: Yes
    2021-11-20 16:17:23, Info Recognized: Yes
    2021-11-20 16:17:23, Info Style: 0
    2021-11-20 16:17:23, Info Offset: 1048576
    2021-11-20 16:17:23, Info Length: 524288000
    2021-11-20 16:17:23, Info Volume: \\?\Volume{a158b599-0000-0000-0000-100000000000}\
    2021-11-20 16:17:23, Info Drive: None
    2021-11-20 16:17:23, Info NT Path: \Device\HardDisk2\Partition1
    2021-11-20 16:17:23, Info ===================PARTITION===============================
    2021-11-20 16:17:23, Info Number: 2
    2021-11-20 16:17:23, Info Type: 7
    2021-11-20 16:17:23, Info Boot: No
    2021-11-20 16:17:23, Info Recognized: Yes
    2021-11-20 16:17:23, Info Style: 0
    2021-11-20 16:17:23, Info Offset: 1599078400
    2021-11-20 16:17:23, Info Length: 250322111488
    2021-11-20 16:17:23, Info Volume: \\?\Volume{a158b599-0000-0000-0000-505f00000000}\
    2021-11-20 16:17:23, Info Drive: C:\
    2021-11-20 16:17:23, Info NT Path: \Device\HardDisk2\Partition2
    2021-11-20 16:17:23, Info ===================PARTITION===============================
    2021-11-20 16:17:23, Info Number: 3
    2021-11-20 16:17:23, Info Type: 39
    2021-11-20 16:17:23, Info Boot: No
    2021-11-20 16:17:23, Info Recognized: Yes
    2021-11-20 16:17:23, Info Style: 0
    2021-11-20 16:17:23, Info Offset: 255504416768
    2021-11-20 16:17:23, Info Length: 553648128
    2021-11-20 16:17:23, Info Volume: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:17:23, Info Drive: None
    2021-11-20 16:17:23, Info NT Path: \Device\HardDisk2\Partition3
    2021-11-20 16:17:23, Info ===========================================================
    2021-11-20 16:17:23, Info MBR2GPT: Conversion failed
    2021-11-20 16:18:28, Info MBR2GPT was explicitly asked to run in full OS mode.
    2021-11-20 16:18:28, Info MBR2GPT: Attempting to convert disk 2
    2021-11-20 16:18:28, Info MBR2GPT: Retrieving layout of disk
    2021-11-20 16:18:28, Info MBR2GPT: Initial partition information
    2021-11-20 16:18:28, Info ===========================================================
    2021-11-20 16:18:28, Info Partition layout for disk: 2
    2021-11-20 16:18:28, Info Partition style : MBR
    2021-11-20 16:18:28, Info MBR signature: 2706945433
    2021-11-20 16:18:28, Info Number of partitions : 3
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 1
    2021-11-20 16:18:28, Info Type: 7
    2021-11-20 16:18:28, Info Boot: Yes
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 1048576
    2021-11-20 16:18:28, Info Length: 524288000
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-100000000000}\
    2021-11-20 16:18:28, Info Drive: None
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition1
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 2
    2021-11-20 16:18:28, Info Type: 7
    2021-11-20 16:18:28, Info Boot: No
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 1599078400
    2021-11-20 16:18:28, Info Length: 253904047104
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-505f00000000}\
    2021-11-20 16:18:28, Info Drive: C:\
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition2
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 3
    2021-11-20 16:18:28, Info Type: 39
    2021-11-20 16:18:28, Info Boot: No
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 255504416768
    2021-11-20 16:18:28, Info Length: 553648128
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:18:28, Info Drive: None
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition3
    2021-11-20 16:18:28, Info ===========================================================
    2021-11-20 16:18:28, Info ESP partition size will be 104857600
    2021-11-20 16:18:28, Info MBR2GPT: Validating layout, disk sector size is: 512 bytes
    2021-11-20 16:18:28, Info BCD: Opening store. Flags: 0x0
    2021-11-20 16:18:28, Info BCD: Store path: "\??\GLOBALROOT\device\harddisk2\partition1\Boot\BCD"
    2021-11-20 16:18:28, Info BCD: Loaded hive at BCD00000000
    2021-11-20 16:18:28, Info BCD: Opening object {9dea862c-5cdd-4e70-acc1-f32b344d4795}
    2021-11-20 16:18:28, Info FindOSPartitions: Default boot entry: {9DAF0541-CAE6-11E9-9E70-AC43DCA04519}
    2021-11-20 16:18:28, Info BCD: Opening object {9daf0541-cae6-11e9-9e70-ac43dca04519}
    2021-11-20 16:18:28, Info VERBOSE: Device path: \Device\HarddiskVolume3
    2021-11-20 16:18:28, Info VERBOSE: Dos path: \\?\GLOBALROOT\Device\HarddiskVolume3
    2021-11-20 16:18:28, Info FindOSPartitions: Volume name for the default boot entry: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:18:28, Info BCD: BcdGetElementDataWithFlags: Failed to open key.Object: {9daf0541-cae6-11e9-9e70-ac43dca04519} Type: 14000008 Status: c0000034
    2021-11-20 16:18:28, Info FindOSPartitions: No Recovery sequence found.
    2021-11-20 16:18:28, Info FindOSPartitions: Default boot entry locale: en-US
    2021-11-20 16:18:28, Info Bitlocker protection for C:\ is either off or suspended.
    2021-11-20 16:18:28, Info Unique ID recap for volumes:
    2021-11-20 16:18:28, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-100000000000}
    2021-11-20 16:18:28, Info Unique ID size: 12
    2021-11-20 16:18:28, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-505f00000000}
    2021-11-20 16:18:28, Info Unique ID size: 12
    2021-11-20 16:18:28, Info Volume name: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}
    2021-11-20 16:18:28, Info Unique ID size: 12
    2021-11-20 16:18:28, Info MBR2GPT: System partition cannot be removed in full OS mode, leaving it untouched.
    2021-11-20 16:18:28, Info MBR2GPT: Trying to shrink the OS partition
    2021-11-20 16:18:28, Warning MBR2GPT: Partition final size is: 553648128 (initial size was 553648128), cannot rely on this space
    2021-11-20 16:18:28, Error Cannot find room for the EFI system partition.
    2021-11-20 16:18:28, Info MBR2GPT: Partition information at error point
    2021-11-20 16:18:28, Info ===========================================================
    2021-11-20 16:18:28, Info Partition layout for disk: 2
    2021-11-20 16:18:28, Info Partition style : MBR
    2021-11-20 16:18:28, Info MBR signature: 2706945433
    2021-11-20 16:18:28, Info Number of partitions : 3
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 1
    2021-11-20 16:18:28, Info Type: 7
    2021-11-20 16:18:28, Info Boot: Yes
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 1048576
    2021-11-20 16:18:28, Info Length: 524288000
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-100000000000}\
    2021-11-20 16:18:28, Info Drive: None
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition1
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 2
    2021-11-20 16:18:28, Info Type: 7
    2021-11-20 16:18:28, Info Boot: No
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 1599078400
    2021-11-20 16:18:28, Info Length: 253904047104
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-505f00000000}\
    2021-11-20 16:18:28, Info Drive: C:\
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition2
    2021-11-20 16:18:28, Info ===================PARTITION===============================
    2021-11-20 16:18:28, Info Number: 3
    2021-11-20 16:18:28, Info Type: 39
    2021-11-20 16:18:28, Info Boot: No
    2021-11-20 16:18:28, Info Recognized: Yes
    2021-11-20 16:18:28, Info Style: 0
    2021-11-20 16:18:28, Info Offset: 255504416768
    2021-11-20 16:18:28, Info Length: 553648128
    2021-11-20 16:18:28, Info Volume: \\?\Volume{a158b599-0000-0000-0000-407d3b000000}\
    2021-11-20 16:18:28, Info Drive: None
    2021-11-20 16:18:28, Info NT Path: \Device\HardDisk2\Partition3
    2021-11-20 16:18:28, Info ===========================================================
    2021-11-20 16:18:28, Info MBR2GPT: Conversion failed
      My Computer


  2. Posts : 21,421
    19044.1586 - 21H2 Pro x64
       #2

    Hello avalen and welcome to TF

    If you don't have a full backup of this drive, make one Backup and Restore with Macrium Reflect and make a MR Rescue USB

    Then try DiskGenius app - it's free and can do the MBR2GPT conversion free.
    https://www.diskgenius.com/download.php

    If it fails, post a screenshot of the partition layout from DiskGenius.
      My Computer


  3. Posts : 18,455
    Windows 11 Pro
       #3

    You just need to use a third party program like MiniTool Partition Wizard Free to shrink C: drive by 200 MB. Notice that is MB and not GB.
      My Computer


  4. Posts : 5
    10
    Thread Starter
       #4

    Steve108... it seemed to convert, but on restart, after setting boot mode to uefi, the m.2 drive is not in the boot list, it is not in any boot list under under csm mode either. However, my computer system information lists the drive. So, no i can't load windows at all on this drive. this is greatly distressing.

    - - - Updated - - -

    darn it Navy... i was hoping you'd find this sooner and help me before i did something as stupid as i think i did by using Steve's suggestion. i had tried the mbr2gpt with a partition boost of up to 1gb and i still had the same errors. i reset the partition and rebooted and tried again and that is when i posted the above log file. Same errors both ways.

    any other suggestion at this point?
      My Computer


  5. Posts : 21,421
    19044.1586 - 21H2 Pro x64
       #5

    Did you change BIOS to UEFI mode after conversion? And I hope you made a backup like I suggested
      My Computer


  6. Posts : 5
    10
    Thread Starter
       #6

    no back-up needed as it is all system files. no lost data, just no operating system. Yes, i did change to UEFI. and for some reason, the nVME drive is not listed as boot drive.
      My Computer


  7. Posts : 21,421
    19044.1586 - 21H2 Pro x64
       #7

    avalen said:
    no back-up needed as it is all system files. no lost data, just no operating system. Yes, i did change to UEFI. and for some reason, the nVME drive is not listed as boot drive.
    If you have a Macrium Reflect USB, you can try the option to repair boot problems, which may fix the issue. Otherwise, let's see what Navy suggests.
      My Computer


  8. Posts : 5
    10
    Thread Starter
       #8

    i don't. not sure how that would help find a drive in the boot list in BIOS. I was really hoping all i had to do was convert to GPT and set the boot mode to UEFI and all would work out... i had a nagging feeling that this M.2 drive would prove problematic. I guess that's why i installed Windows 10 on it in CSM mode 7 years ago when i initially built this rig. Though, since then, i swapped out motherboard and went AMD instead of Intel. I popped this M.2 drive into the new MB and booted and Windows just loaded. i was astonished, but since it worked, i wasn't going to touch it. and i wouldn't have touched it now, but Windows 11 is what it is and i can't get around not having a UEFI system.
      My Computer


  9. Posts : 21,421
    19044.1586 - 21H2 Pro x64
       #9

    FYI: Fix Boot Problems

    Not sure what the problem at hand is and if it would be solved by MR Rescue, but this I always have a MR Rescue USB at hand and would try it in a situation like this.

    Mean time, hopefully Navy's ship comes back into port soon
      My Computer


  10. Posts : 5
    10
    Thread Starter
       #10

    i hope he does. from what i read in other posts with related issues, he was the most articulate and helpful. my first time posting.

    well, as usual, i'm too impatient... i set bios to uefi only, popped in the old W10 disk (i don't care if i have some updates - or should i?) and reformated the drive and reinstalled.
    Last edited by avalen; 20 Nov 2021 at 23:02.
      My Computer


 

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