exe is a Windows built-in tool used to convert a disk from MBR to GPT. Here is the guide: MiniTool Partition Wizard Free Click to Download 100% Clean & Safe. mbr2gt is very finnicky. The MBR2GPT tool will work only if your system meets the. . The hard disk will be used as an external hard drive. Type convert gpt. Type clean and hit Enter. Now type CONVERT GPT. MBR2GPT: Retrieving layout of disk. It doesn't require partition deleting or formatting before MBR to GPT converting process. Step 1. 2. Even though the tools gptgen and mbr2gpt. MBR2GPT. PS C:\Users\Marcelo Pires> mbr2gpt /validate . I then tried to start with a Windows 10 install disk. It won’t work for any data disks that don. 2k 35 35 gold badges 105 105 silver badges 133 133 bronze badges. Once the installing is finished,. Also, the system might become unbootable. MBR2GPT. Step 1. MBR2GPT cannot find OS partition . 1. When choosing an installation type, select Custom. 2 drive in the motherboards M2 [A] slot) And it shows as the. . The mbr2gpt tool can be used to convert the partition table both in Windows PE (Windows Preinstallation Environment) and directly from the running Windows 10. If conversion is successful the disk can only be booted in GPT mode. A good backup is strongly recommended, because things happen. MBR2GPT will now attempt to convert disk 4. Use /allowFullOS to override. EXE" to convert the VM disk from MBR to GPT. 1) The internal command line application MBR2GPT. Completely erase (clean) disk 1 and convert it to GPT. C:\WINDOWS\system32>mbr2gpt. Windows Command Prompt. - Boot from a USB Win 10 installation drive. The last line in the file should state why the validation failed. First, we cannot use the MBR2GPT to convert non-system disks from MBR to GPT, so you don’t need to consider using the mbr2gpt on ALL of your Harddisks. exeというcmdに似た画面が開くのでここにlist diskとコマンド。 GPTの列に＊マークがあればGPT、なければMBR。 GPTに変換できるかチェック 変換したいディスクをdisk:0とする（ディスクは上記で調べる）。 cmdで以下をコマンド。 mbr2gpt /validate /disk:0. When it ask you where you want to create that media you choose your USB Key (8GB USB Key minimum). Veamos un laboratorio completo de cómo convertir mbr (BIOS) a gpt (UEFI) sin perder datos:MBR2GPT: 1) El cambio es irreversible: No podremos volver a MBR (BIOS). 1 Press the Win + R keys to open Run, type diskmgmt. – Massimo. Follow this steps: - Detach (SATA or power cable) drive 1 & 2 from the MB. Right-click on each partition on the disk you want to convert and select " Delete Volume " to clean the disk. This command converts the disk in question (disk 0) to a GPT disk, which is used in UEFI. Before converting, ensure a bootable Windows installer USB pen drive is present, which can be used to correct this if it occurs. i tried to to use mbr2gpt to convert my mbr to gpt and it said ERROR: MBR2GPT can only be used from the Windows Preinstallation Environment. As mentioned earlier, MBR2GPT is used to convert all MBR formatted system disks to GPT. WinPE_X86_PSmountoot2. 3. list disktwo way, you can do. UEFI boot needs boot partition must be GPT while other partitions don’t need. This way can ensure the consistency of the data and the operating system can start normally after the conversion. exe and convert it to MBR. I am trying to convert using Option 1 (mbr2gpt / convert / allowfullOS), and I get the following error: My pc has two disks, an SSD (where W10 is installed), and an HDD (data only). How to convert MBR to GPT in Windows 11 with native Disk Management: Press Windows + X keys together and click Disk Management in the list. exe is a Windows 11/10 native disk conversion tool PC users can use to convert a disk with the MBR partition table to a GPT. Previous methods are considered a destructive conversion as the technician, application, or process must wipe the disk before converting the disk to a GPT disk. By default, MBR2GPT. Use mbr2gpt to convert partition table to GPT:Si no especifica este parámetro cuando usa mbr2gpt desde Windows, aparecerá un error: ERROR: MBR2GPT can only be used from the Windows Preinstallation Environment. type: diskpart. . Press Windows + X together on your keyboard and click Disk Management in the list. これを使用して、OS・データはそのままでCドライブをGPTへ変換できました。. Use /allowFullOS to override. If it somehow doesn't, "installing from scratch" also includes the option of archiving the main partition to an image with dism. EXE for the system disk, because it is more involved than the rest – it means switching to the EFI boot process, which means building an EFI System Partition and such (the tool will do that automatically, but it's still a bit more than just converting a data disk). EXE /convert MBR2GPT will now attempt to convert the default book disk. 5. wしかし、Windows11がUEFIのみの対応の為、Microsoftから元のシステムがレガシー (MBR)環境でも、UEFI環境からの (GPT)起動が可能としてブート情報を追加して変換できるコマンドが「コマンドプロンプト」にて 『mbr2gpt. I can run this from WinPE but will it do what I want? My system is already a UEFI/GPY system, I just want to convert Disk 2 from MBR to GPT. CDROMs and DVDs are examples of disks that are not convertable. 2. How to convert MBR to GPT in Windows 10 with MBR2GPT command: Back up your system with Windows native or third party software in case of. EDIT: Just saw that you're a mix of HP and Surfaces. Greetings. exe to perform the disk validation and to proceed with the conversion if all validation tests pass. My guess the partition responsible for booting your system is on a different disk than the OS. MBR2GPT is specifically designed to convert disks that contain a Windows partition from MBR to GPT, because it was developed to facilitate migrating from Legacy BIOS to UEFI booting on systems that support both modes but may have been configured to boot Windows in BIOS mode instead of UEFI. Share. Mbr2gpt. In order for this command to work as intended, you have to make sure you have the latest version of Windows 10 for example, if you are doing this for the Windows 11 upgrade. I open a command line in Windows and run: mbr2gpt /validate mbr2gpt /convert. - Specifies the GPT partition type to be used for a given MBR partition type not recognized by Windows. The update that we’re previewing in Release Preview. MBR2GPT utility is available only in Windows 10 version 1703 or later. I was then able to use mbr2gpt /convert and the conversion worked! Nothing was lost (other than a lot of hair), and I checked the system with PC Health and got confirmation - the system requirements for Windows 11 are now met!. Use /allowFullOS to override. Before any major change, as ever, make sure you back up. Click on OK to confirm if you are converting an OS disk to GPT. 2) You can delete SRP first to reduce MBR partitions to 3. Windows 10 is installed on Disk 3 (per Disk Management. MBR2GPT: Validating layout, disk sector size is: 512 bytes . Jul 28, 2021. 4. exe to perform only the disk validation steps and report whether the disk is eligible for conversion. Repeat this step to delete the remaining volumes. MBR2GPT tiene los siguientes códigos de retorno asociados: Código de retorno. Now boot your computer using the Windows 10 USB pen drive. For details, see Convert MBR partition to GPT. MBR2GPT: Before the new system can boot properly you need to switch the firmware to boot to UEFI mode! I then went into the bios and changed to UEFI and enabled Secure Boot but Windows was unable to boot. bcdboot C:Windows /s C: /f BIOS. msc. Step 1. Run reagentc /disable. > mbr2gpt /convert /disk:0 MBR2GPT will now attempt to convert disk 0. When I did this, I was unable to see the drives. C:Windowssystem32>mbr2gpt. 2021-09-14. hold down the shift key while clicking power > restart > click troubleshoot > click command prompt. msc. C:windowssystem32>mbr2gpt /convert /disk:0 /allowfullos MBR2GPT will now attempt to convert disk 0. Download and launch EaseUS Partition Master on your computer. First, all hard disks can be displayed in the command prompt with the command "list disk". Step 1: Download, install, and launch MiniTool Partition Wizard. I assumed the disk image would include the disk layout (GPT or MBR) of the original disk, but it appears that is not. 2) Después de la conversión. In the Disk Management window, right-click the disk you want to check, and click Properties. Open your computer normally. Apply MBR2GPT. Run the mbr2gpt from it. before choosing the disk which you want to change. Windows 10 Recovery Tools - Bootable Rescue Disk Solved - Windows 10 Forums Detach (power or SATA cable) of all other disks Make sure. Type clean and press Enter key. Also: In der Suche mbr2gpt. Use gdisk (not gparted) for the data disks. exe is a new built-in Windows 10 console tool that allows you to convert a disk with the MBR (Master Boot Record) partition table to a GPT (GUID Partition Table) without data loss and without the need to delete existing partition. Try this: Run CMD as Admin and run diskpart. As for the reason MBR was used, you booted to the installation media, with UEFI mode disabled more than likely. Use the command detail partition to see if it's marked as "Active No", and if so type the Active command. Note: Since the existing MBR system partition is in use while running the full Windows environment, it can't be reused. 2. It runs under Parallels, on a MacBook Pro. If conversion is successful the disk can. Virtual Disk Service error: The specified disk is not convertible. diskpart. For posts please use share links (one drive, drop box, or google drive) 3) Open administrative powershell and type or copy and paste: a) mbr2gpt /validate /allowFullOS. But only 64-bit editions on UEFI-based systems can be used as system disks. You can also convert the partition table on Linux after having a working ESP prepared on. MBR2GPT: Retrieving layout of disk . 1. I restarted my laptop and pressed F2 to access the BIOS, and from there I switched to UEFI. Edit it to select the correct disk #. ; Under the "Advanced startup" section, click the Restart now button. As mentioned before, the MBR2GPT. Another source of problem might be no free (unallocated) space, mbr2gpt requires a small amount of free space at the front and end of drives. Help. C:\windows\system32>mbr2gpt /convert /disk:0 /allowfullos MBR2GPT will now attempt to convert disk 0. On Windows, the max is 128. Now run mbr2gpt /convert /disk:ID with the ID: X:\>mbr2gpt /convert /disk:0 MBR2GPT will now attempt to convert disk 0. See the below screenshot. Without Legacy Mode, only GPT is allowed for Windows 64-bit. I was then able to use mbr2gpt /convert and the conversion worked! Nothing was lost (other than a lot of hair), and I checked the system with PC Health and got confirmation - the system requirements for Windows 11 are now met!. ; Right-click the disk shown as (Disk x, Basic, Capacity, Online) on the left (Where it says Disk 0 as shown in. If you use it to convert a data disk, you can receive an error: MBR2GPT cannot find OS. You are only allowed to run the tool from Windows PE. that Windows does not. If everything is ok run mbr2gpt /convert. MBR2GPT: Validating layout, disk sector size is: 512 bytes. The MBR2GPT tool will work only if your system meets the. exe provided by Microsoft. If conversion is successful the disk can only be booted in GPT mode. Type select disk 1 to tell diskpart you’d like to perform an action on a disk. Initially I had Win10 loaded and things were fairly stable and was able to run the conversion to GPT and utilize UEFI. You can't use the tool to convert non-system disks from MBR to. Here is how you create your own USB Key Windows 10 installation media. Then you have to copy all her data to the SSD. Drill down to the C: partition by list disk and select disk # and list partition and select partition #. /validate Instructs MBR2GPT. Previous methods are considered a destructive conversion as. exe to perform the disk validation and to proceed with the conversion if all validation tests. The launch of Windows 11 is 6 months away, you have plenty of time, I have seen so many people loose all their data converting the drive from MBR to GPT, honestly the only successful method is to backup all your data, then clean install Windows 10 from a bootable USB and then re-install all your software, it is a big job. The only item available in the "Troubleshoot" menu is "UEFI Firmware settings. Do that on the outgoing disk, enable UEFI boot mode, make sure it works, and then just make an image backup of your converted disk to use as-is for your new disk. This tool can be used to efficiently and losslessly convert MBR disks (for legacy BIOS) to GPT (for UEFI) on Windows 10. The only downside is that it will not switch from legacy boot to UEFI boot or enable Secure Boot. I have a windows 10 laptop, and I wanted to convert my MBR hard disk to GPT so I can switch from Legacy BIOS to UEFI (I made sure that my laptop supports UEFI). Try this: Run CMD as Admin and run diskpart. Then click on Apply to execute the conversion. Multiple /map switches are allowed. I read a bit about it, and it seems to not work because disk 0 isnt a system disk, but in my. Make sure to back up the ReAgent. C:\Windows\system32>mbr2gpt /convert. Das Tool wird über eine Windows PE-Eingabeaufforderung (Windows Preinstallation Environment) ausgeführt, kann aber auch über die vollständige Windows 10 Betriebssystem. If you want to upgrade to Windows 11, you should convert the MBR system disk to GPT, so many users want to use MBR2GPT for Windows 11. Also,. Change the settings from Legacy BIOS mode to. Atem-boi. Then you can swap drives and boot into drive 0 and run mbr2gpt on that drive. Once you’ve confirmed the conversion can take place, now remove the /validate switch to perform the conversion for. mbr2gpt /validate type send then mbr2gpt convert. MBR2GPT: Retrieving layout of disk . Step 3. Nov 4, 2022 at 10:51. It should be started with a special set of arguments. The tool is designed to be run from a Windows Preinstallation Environment (Windows PE) command prompt but can also be run from the full Windows 10 operating system (OS). Try the MBR2GPT conversion tool. UEFI firmware can install Windows 10 to MBR, but the UEFI BIOS must be set to Legacy Mode. . In reply to Windows 10 new tool MBR2GPT. MBR2GPT: Attempting to validate disk 0 . 1. Right-click on the target disk, and select " Convert to GPT Disk ". Converting from MBR to GPT is not entirely without risk, and it's possible that your hardware might not support GPT. using cmd (in admin mode), one is run then cmd and in admin mode. 今回は、デスクトップPCのマザーボードなどの. Omega. In case you want to make a conversion of MBR2GPT, you can make use of professional software. When. I guess it's possible to use Startup repair from a Windows bootable USB stick to fix a non-bootable drive, but I haven't tried. You can make use of the following steps for this tool: Step 1. 4 hours ago, asheenlevrai said: I can boot the cloned NVMe drive when it's still in MBR mode but when I try to convert: C:WINDOWSsystem32>mbr2gpt /validate /disk:1 /allowFullOS. EXE for the system disk, because it is more involved than the rest – it means switching to the EFI boot process, which means building an EFI System Partition and such (the tool will do that automatically, but it's still a bit more than just converting a data disk). Windows 10はバージョン1703以降で、ディスクパーティション形式をMBRからGPTへ変換する MBR2GPT. active. The hard disk will be connected using a SATA port. Apply MBR2GPT. The MBR2GPT can be used on Windows 10 version number 1703 and later. Click the Command Prompt option. MBR2GPT: Validating layout, disk sector size is: 512 bytes. EXE tool to convert the MBR disk to the GPT partition format. If conversion is successful the disk can only be booted in GPT mode. mbr2gpt /validate /disk:0 /allowFullOS . リターン コード. Provide us a screenshot of the partitions within Disk Manager. If you already have Secure Boot enabled, and Windows will boot, your disk is already GPT. Right-click on the Windows icon and click on “ Run “. See also Convert MBR to GPT - Without any OS. In this case source partition can be on mbr disk and target on gpt disk. exe to convert MBR to GPT (Complicated, Suitable for Advanced Users)How to Use MBR2GPT. These changes cannot be undone! MBR2GPT: Attempting to convert disk 0 . See also Convert MBR to GPT - Without any OS. Convert MBR to GPT CMD using Diskpart utility (Need to Delete Partitions) Tip 2. Type: ctrl + a. I used Windows' DISKPART tool to identify the disk I want to convert. Therefore you can take advantage of all of the features offered by GPT disks even though your motherboard only supports BIOS mode. 3. In the cmd elevated command prompt, type mbr2gpt /convert /disk: n /allowfullOS. 5. Step 4. If you use VMware, Hyper-V virtual machine, you just need to select this ISO file and boot from it. The process fails repeatedly, returning the following error: MBR2GPT will now attempt to convert the default book disk. There is no dispute about that. " Because MBR2GPT was used, the partitions aren't standard: the recovery partition (System_DRV) comes first, followed by the EFI partition and the C drive. I have went through with the process, converted my boot SSD to GPT using mbr2gpt. There is no MSR partition. EXE? See Correct Steps. EXE convertit un disque d'enregistrement de démarrage principal (MBR) en un style de table de partition GUID (GPT) sans modifier ou supprimer les données contenues sur le disque. IM-Magic Partition Resizer ensures that you can carry out the conversion process under a few clicks with a 100% safety. A data disk can be backed up, converted, then restored using dism and the disk management console. Related links. - Hard disk with multiple bad sectors. . I quickly found the MBR2GPT tool, but I wonder if the result would be nice or if it would be better a clean installation. diskpart. The MBR2GPT only supports converting MBR system disk to GPT. tenforums members repeatedly recommend the routine use of. wim" REM NOTE: The following can only be run from the "Deployment and Imaging Tools. Right-click the disk that you need to convert (here is system disk) and choose “Convert to GPT”. Supported drive size: While it can read drives above 2 TB, anything over 2 TB will be unusable. - Move the data off, delete the partition, set it to GPT, create a partition, move the data back. Confirm the UAC dialog if it appears. Click the system disk and choose “Convert to GPT” from the right toolbar. Tutorial Recommendation. For your reference, they are: /validate Instructs MBR2GPT. exe" ohne Datenverlust auf GPT konvertieren. Step 4: Right-click on the system disk and choose Convert MBR Disk to GPT Disk. # 6. The drive will appear as a single area of unallocated space. Create bootable USB with Rufus → Reboot → Disable CSM Mode in the UEFI firmware. Right-click the MBR disk that you need to convert to GPT and choose “ Convert to GPT ”. EXE 可将磁盘从主启动记录 (MBR) 转换为 GUID 分区表，. It can only be used after bcdboot. Click Yes and then Yes again to confirm two warnings. <bcd_guid> is the Boot Configuration Data (BCD) identifier of the target Windows installation, obtained by running bcdedit -enum -v. The mbr2gpt tool can be used to convert the partition table both in Windows PE (Windows Preinstallation. Step 4. Jul 30, 2019 @ 1:08pm First make sure your BIOS is set to UEFI and AHCI. convert gave this (which i saw later due to missing stuff from 1903 and up) C:WINDOWSsystem32> MBR2GPT. Use MBR2GPT. Reply. 1) You cannot use mbr2gpt if 4 MBR partitions to start with - from log you can see it creates EFI first then does conversion to GPT. Try the MBR2GPT conversion tool. Some users report that MBR2GPT can’t find the operating system (OS) partition on disk 0 when they attempt to do the conversion. Step 4. ; Locate your primary system boot partition. This option overrides this block and enables disk conversion while running in the full Windows environment. exe – это встроенная консольная утилита Windows 10, которая позволяет сконвертировать диск с таблицей разделов MBR (Master Boot Record) в таблицу GPT (GUID Partition Table) без потери данных и без необходимости. 3. 版本：win10 1703 当前主机非PE. But only 64-bit editions on UEFI-based systems can be used as system disks. MBR2GPT cannot find OS partition . WinPE_X86_PSmountoot2. As for the GPT disk, it almost has no limitation to the number of partitions. diskpart – select disk command. Right-click “ My Computer/This PC ” -->” Manage ”-->” Disk Management ”. Before attempting the convert i deleted the recovery partition as you cannot do the convert if you have more than 3 separate partitions shown in Disk Management. " Now I get this. Now just run mbr2gpt to do the conversion, for example the below will convert disk 0 to GPT. There is no MSR partition. Now just to confirm that disk has been converted to GPT type LIST DISK. Right-click on the Windows icon and click on “ Run “. 使用 MBR2GPT. If conversion is successful the disk can only be booted in GPT mode. If conversion is successful the disk can only be booted in GPT mode. Try the MBR2GPT conversion tool. Instead, reboot your system into your BIOS Setup. Converts a disk from MBR to GPT partitioning without modifying or deleting data on the disk. exe to perform only the disk validation steps and report whether the disk is eligible. Best Way to convert MBR to GPT without Losing Data (For Beginners) Tip 1. The data disks aren’t supported. Right-click diskmgmt. In the next window, click “OK” to confirm your operation. This number is important for next step. Once the disk is converted to GPT, and you can create a New Simple Volume. C:WINDOWSsystem32>mbr2gpt. One of the other requirements is not to have any extended partitions, look to the primary rule of only having 3 partitions, on the reason why that's the case. However, I found that my USB is booted only in EFI style, and Windows 10 is refusing to be installed to my BIOS/MBR/CSM mode system when my USB is booted in EFI style. These changes cannot be undone! MBR2GPT: Attempting to convert disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 bytes MBR2GPT: Trying to. If there is only one hard disk, it has the number "0". It is not necessary to boot from UEFI in order to utilize disks partitioned with the GPT partition scheme. If conversion is successful the disk can only be booted in GPT mode. Then, make sure that your system supports EFI/UEFI mode and click “ Yes ”. 2) You can delete SRP first to reduce MBR partitions to 3. Step 3. These changes cannot be undone! MBR2GPT. GPT supports Cyclic Redundancy Check (CRC) for the integrity of data, while. Verify that the disk status is Online, else right-click and select Initialize disk. By default, MBR2GPT. MBR2GPT: Retrieving layout of disk . exe /validate /allowfullos. Here are the comprehensive instructions for updating to Windows 11: Step 1. MBR2GPT command can only convert system MBR disk to GPT. Step 3. These changes cannot be undone! MBR2GPT: Attempting to convert disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 bytes MBR2GPT: Trying to shrink the system partition MBR2GPT: Trying to shrink the OS partition Cannot find. Start the tool on the running system. first before running the convert. it's a pain. 3. exe and extract with it after you have re-partition your drive with GPT. 2. In the command prompt, do this: Type: diskpart. Hello, while i was trying these commands to covnert MBR to GPT. Press Shift while clicking Restart > Troubleshoot > Advanced Options > Command Prompt. After Windows is installed, if you need to switch firmware modes, you may be able to use the MBR2GPT tool. To make it work with UEFI I believe I have to set up an EFI partition for Windows to boot from. If validated then continue with the conversion: mbr2gpt /convert /allowfullos . After that, write “ cmd ” and right-click on “ Command Prompt. 5) There are prerequisites for MBR2GPT: The disk must be the system disk, not an external disk. boot into safe mode, run mbr2gpt /convert /allowFullOS, then restart and enable UEFI. type: mbr2gpt /validate /allowfullos. Also, small world as we have a few of that model Probook at the. These changes cannot be undone! MBR2GPT: Attempting to convert disk 1. Hopefully you'll see a "Validation completed successfully" message. According to Microsoft, MBR2GPT. The way to convert a boot able Legacy-MBR to a boot able UEFI-GPT is to use MBR2GPT. /convert Instructs MBR2GPT. Thus, you may need to upgrade your Windows to a higher version, like Windows 11. - Disable Win RE. You can choose the proper one to. This needs to be upvoted more. Type: list disk. <bcd_guid> is the Boot Configuration Data (BCD) identifier of the target Windows installation, obtained by running bcdedit -enum -v. If not specified, the system disk is used. MBR disk only supports 4 primary partitions or three primary partitions plus one extended partition. . MBR2GPT: Attempting to validate disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 bytes Disk layout validation failed for disk 0 . EXE tool when in Windows PE instead of in the full OS. Go to the Start Menu and search for Create and format your hard disk partitions to find the Best match. exe has been run. exe /convert /allowfullos. 2. Otherwise, the conversion will be failed. Note that Windows can use a GPT disk in Legacy Mode, as long as this is. I'd rather not reinstall all my software. 日志：目测是"Recognized: No"这个地方的问题但是不知道怎么处理。 setupact. If you use MBR2GPT command line, then you only convert the selected partition. Step 2. - Change BIOS mode to UEFI. You would have to copy the contents elsewhere or make a backup, then. Ahva intends to add the hard disk to a storage pool. However, you can use An attribute to allow the existing partition to run the MBR2GPT tool. Boot from windows bootable image. Right-Click on the DISK 0 Drive where you want to create an unallocated space and select the “Shrink Volume” option. C Drive. MBR2GPT には、次のような関連するリターン コードがあります。Limitless Technology 42,981. Attachments Below Will Show My hard drive partition configuration. Jetzt habe ich gelesen, man kann dies mit dem Boardmittel "mbr2gpt. MBR2GPT: Validating layout, disk sector size is: 512 bytes. (All operations before clicking Apply only work in. exe" is a specific utility provided by Microsoft as part of Windows 10, starting with version 1703, which allows users to convert a disk from MBR (Master Boot Record) to GPT (GUID Partition Table) without data loss. 报错：ValidateLayout: Unrecognized partition found, index 1，Disk layout validation failed for disk 0 磁盘管理如下：. Step 4: Right-click the Windows Start screen button and select Command Prompt (Admin) on the desktop. Step 2. 4) this is major: if you reverse a conversion to GPT back to MBR, everything will remain broken until AFTER you delete the EFI partition that the GPT conversion created. The syntax of the command is as follows: MBR2GPT /validate|convert [/disk:] [/logs:] [/map:=] [/allowFullOS] Here is a brief description of the available command line parameters.