要將磁盤從GPT轉(zhuǎn)換為MBR，必須先備份數(shù)據(jù)，因?yàn)榇瞬僮鲿?huì)清除磁盤上所有內(nèi)容；1. 以管理員身份打開(kāi)命令提示符並運(yùn)行diskpart；2. 輸入list disk查看磁盤列表；3. 使用select disk X選擇目標(biāo)磁盤；4. 執(zhí)行clean命令清除所有分區(qū)；5. 運(yùn)行convert mbr將分區(qū)樣式轉(zhuǎn)換為MBR；6. 輸入exit退出工具；此外，也可在Windows安裝過(guò)程中通過(guò)Shift F10打開(kāi)命令提示符並執(zhí)行相同diskpart步驟完成轉(zhuǎn)換；需注意MBR僅支持最大2TB磁盤，且轉(zhuǎn)換後需在BIOS/UEFI中啟用Legacy/CSM模式才能正常啟動(dòng)，因此僅在安裝舊版系統(tǒng)或特定需求時(shí)建議使用MBR，否則應(yīng)保留GPT格式以獲得更好的兼容性和性能。

Converting a disk from GPT (GUID Partition Table) to MBR (Master Boot Record) in Windows is something you might need to do when installing older versions of Windows (like 32-bit systems or legacy BIOS-based setups), or when dealing with software or systems that don't support GPT. However, this process will erase all data on the disk , so backing up your data first is essential.

Here's how to change the partition style from GPT to MBR in Windows:

? Method 1: Using DiskPart (Command Line)

This is the most reliable and built-in method using Windows' DiskPart utility.

Step 1: Open Command Prompt as Administrator

• Press Win X and select Command Prompt (Admin) or Windows Terminal (Admin) .
• If prompted by UAC, click Yes .

Step 2: Launch DiskPart

Type the following command and press Enter:

 diskpart

Step 3: List All Disks

To see which disk you want to convert, type:

 list disk

Look for your target disk (eg, Disk 0, Disk 1). Note the disk number and its size to identify it correctly.

Step 4: Select the Target Disk

Replace X with the actual disk number:

 select disk X

?? Be absolutely sure you've selected the correct disk — this process will erase everything on it.

Step 5: Clean the Disk

This removes all partitions and data:

 clean

Step 6: Convert to MBR

Now convert the partition style:

 convert mbr

Step 7: Exit

Type:

 exit

Then close the Command Prompt.

You can now create new partitions on the MBR disk using Disk Management or continue setting up your OS.

?? Method 2: During Windows Installation (Clean Install)

If you're reinstalling Windows and need MBR, you can do this during setup:

1. Boot from the Windows installation USB/DVD.
2. When you reach the "Where do you want to install Windows?" screen, don't see any partitions? Press Shift F10 to open Command Prompt.
3. Run:

    diskpart
   list disk
   select disk X
   clean
   convert mbr
   exit

4. Close the Command Prompt and refresh the installation window.
5. You can now create new partitions on the MBR disk and proceed with installation.

? Note: If your system uses UEFI firmware, it expects GPT. Converting to MBR usually requires switching the BIOS/UEFI mode to Legacy (CSM) mode to boot properly.

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?? Important Notes

• Data Loss : The clean command deletes everything on the disk. Always back up first.
• Disk Size Limitation : MBR only supports up to 2TB. If your disk is larger, you'll lose access to the extra space unless you use multiple partitions (still limited).
• Boot Mode Compatibility :
  • UEFI GPT → Modern standard.
  • Legacy BIOS MBR → Older systems. You may need to change your BIOS/UEFI settings to Legacy/CSM mode to boot from an MBR disk.

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? When Should You Use MBR?

• Installing Windows on older hardware.
• Dual-booting with older OS versions that don't support GPT.
• Using certain third-party tools or embedded systems that require MBR.

Otherwise, GPT is recommended for modern systems due to better reliability, support for larger disks, and secure boot compatibility.

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Basically, the conversion is straightforward using diskpart , but only do it if absolutely necessary , and always back up your data first.

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