Converting Your Hard Drive From MBR to GPT: What You Need to Know

What MBR and GPT are, and why you might need to switch

MBR (Master Boot Record) and GPT (GUID Partition Table) are two different ways your computer organizes the storage space on your hard drive. MBR is the older standard, used on most computers built before 2010. GPT is newer and handles larger drives better — if you have a drive larger than 2 TB, or you're installing Windows 11, you'll need GPT.

The conversion itself doesn't erase your files, but it does require backing up everything first. The process involves using built-in Windows tools or third-party software to rewrite how your drive is organized at the lowest level. After conversion, your drive will work the same way from your perspective, but your computer will be able to use it more efficiently.

You might need to convert if you're upgrading to Windows 11 (which requires GPT on most systems), adding a large external drive, or preparing a drive for a newer computer. Some users also convert when they want to use more than four primary partitions on a single drive — GPT allows up to 128.

Key Takeaways

Back up all your files to an external drive or cloud storage before starting any conversion, since the process rewrites your drive's partition table.
Windows 11 requires GPT on most systems, while Windows 10 and earlier work with either MBR or GPT.
You can convert a data drive (one that doesn't contain Windows) using the Disk Management tool built into Windows, which takes a few minutes.
Converting your system drive (the one Windows is installed on) requires either third-party software like MiniTool Partition Wizard or reinstalling Windows after the conversion.
External drives and USB drives can be converted the same way as internal data drives, using Disk Management or command-line tools.

How to check whether your drive is MBR or GPT right now

Open Disk Management by right-clicking the Start menu and selecting "Disk Management," or by typing "diskmgmt.msc" into the search box. Find your drive in the list, right-click it, and select "Properties." Click the "Volumes" tab — if it says "Partition style: Master Boot Record," you have MBR. If it says "GUID Partition Table," you already have GPT.

You can also check from Command Prompt. Right-click the Start menu, select "Windows Terminal (Admin)" or "Command Prompt (Admin)," then type diskpart and press Enter. Type list disk to see your drives. Type select disk X (replace X with the number of your drive), then type detail disk. The output will show "Partition Table: MBR" or "Partition Table: GPT."

Converting a data drive using Windows Disk Management

If the drive you want to convert doesn't contain Windows (a second internal drive, external drive, or USB stick), you can use Disk Management. First, back up everything on that drive. Then open Disk Management, right-click the drive you want to convert, and select "Delete Volume" for each partition on it. This erases the drive but doesn't affect other drives.

Once all partitions are deleted, right-click the empty drive and select "Convert to GPT Disk." Windows will rewrite the partition table. After conversion, right-click the drive again and select "New Simple Volume" to create a new partition you can use. The whole process takes a few minutes.

This method works for internal drives, external USB drives, and SD cards. It does not work for your system drive (the one Windows is installed on) — if you need to convert that, see the next section.

Converting your system drive (the one Windows is on)

Converting the drive that Windows itself is installed on is more complex because Windows needs to be running from somewhere while you rewrite the partition table. You have two main options: use third-party software that can do the conversion while Windows is running, or reinstall Windows after converting the drive.

Third-party tools like MiniTool Partition Wizard (free version available), AOMEI Partition Assistant, or EaseUS Partition Master can convert an MBR system drive to GPT without erasing it. Download the software on your current computer, install it, select your system drive, and choose the convert option. The tool will schedule the conversion to run at the next restart, before Windows fully loads. This takes 10 to 30 minutes depending on how much data is on the drive.

The alternative is to back up Windows itself (using Windows Backup or a tool like Macrium Reflect), convert the drive to GPT using Disk Management, then restore Windows to the converted drive. This is more time-consuming but avoids installing third-party software.

Converting from the command line with diskpart

If you're comfortable with Command Prompt, you can convert a data drive using the diskpart tool. Right-click the Start menu and select "Windows Terminal (Admin)" or "Command Prompt (Admin)." Type diskpart and press Enter.

Type list disk to see all your drives and note the number of the one you want to convert. Type select disk X (where X is that number). Type clean to erase all partitions — this deletes everything on the drive, so be certain you have it backed up. Finally, type convert gpt and press Enter. The conversion happens immediately. Type exit to close diskpart.

After conversion, you'll need to create a new partition. You can do this in Disk Management by right-clicking the drive and selecting "New Simple Volume," or continue in diskpart by typing create partition primary and format fs=ntfs quick.

What to do if the conversion fails or gets stuck

If Disk Management won't let you convert the drive, it usually means there's a partition you can't delete — often a recovery partition or a partition marked as system. Right-click the drive in Disk Management and look for any partitions marked "System" or "Recovery." You may need to delete these first, though this can prevent Windows from booting if it's your system drive.

If you're using diskpart and the convert gpt command fails, the drive may have a protective MBR or other low-level issues. Try typing clean all instead of clean — this takes longer but removes all data more thoroughly. If that still doesn't work, the drive may have hardware issues, and you should back up any remaining data and consider replacing it.

If a third-party tool's conversion gets interrupted (power loss, restart), don't panic. Restart the computer and let the tool finish the job at the next boot. If it's truly stuck, you can use diskpart to check the current state: select the drive and type detail disk to see whether it's MBR or GPT now.

After conversion: what changes and what stays the same

After conversion, your drive works exactly the same from your perspective. Files are still there, programs still run, and you interact with the drive the same way. The only visible difference is that Disk Management and the drive properties will now show "GUID Partition Table" instead of "Master Boot Record."

If you converted your system drive, your computer may boot slightly differently — it will use UEFI firmware instead of legacy BIOS — but this is invisible to you. If you converted a data drive, nothing changes in how you use it. You can still add files, delete files, and format it normally.

One practical difference: if you ever need to recover deleted files from a GPT drive, some older data recovery tools won't work. Modern tools like Recuva, EaseUS Data Recovery Wizard, and MiniTool Power Data Recovery all support GPT drives.

Frequently Asked Questions

Will converting to GPT make my computer faster?

No. GPT and MBR don't affect speed. The conversion is necessary for Windows 11 compatibility, to use drives larger than 2 TB, or to have more than four partitions, but it won't make your computer run faster or slower.

Can I convert back from GPT to MBR if I change my mind?

Yes, using the same tools. In Disk Management, right-click the drive and select "Convert to MBR Disk." In diskpart, select the drive and type convert mbr. Both methods erase the drive, so back up first. You can only convert your system drive back to MBR if you're willing to reinstall Windows or use third-party software.

Do I need to convert external drives and USB sticks to GPT?

Only if you need to store a single file larger than 4 GB, or if you're using the drive with a Mac (which prefers GPT). For regular use with Windows, MBR works fine on external drives. If you do convert, the drive will still work with Windows, Mac, and Linux.

What if my computer won't boot after I converted the system drive?

This usually means the BIOS or UEFI firmware settings need to be updated to match the new partition style. Restart the computer and enter the BIOS setup (usually by pressing Delete, F2, or F12 during startup — check your computer's manual). Look for a setting called "Boot Mode" or "CSM" (Compatibility Support Module) and change it to match your new partition table. If you're unsure, contact your computer manufacturer's support.

Is it safe to convert a drive while Windows is running?

It's safe to convert a data drive (one that doesn't contain Windows) while Windows is running — Disk Management and diskpart both allow this. For your system drive, third-party tools handle the conversion safely by scheduling it to run at restart before Windows loads. Never try to convert your system drive using Disk Management while Windows is running.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.