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Understand Microsoft Reserved partition

The Microsoft Reserved partition, or MSR, is a small GPT system partition used by Windows and should ordinarily remain untouched.

Quick answer: The Microsoft Reserved partition, or MSR, is a small GPT system partition used by Windows and should ordinarily remain untouched.

When this approach makes sense

Check GPT versus MBR, the current filesystem, whether Windows boots from this disk and any hardware/device compatibility requirements. This guide explains how to approach understand microsoft reserved partition without assuming every disk or license is identical.

How to proceed on Windows

  1. Step 1. Inspect the disk in Disk Management or a partition tool.
  2. Step 2. Distinguish MSR from unallocated space and ordinary data partitions.
  3. Step 3. Exclude it from routine move, delete and format tasks.
  4. Step 4. Document the layout before any advanced migration.
Important: Removing MSR is not a safe way to gain meaningful storage capacity. Back up important data to a different physical drive before changing a live partition or filesystem.

How to verify the result

The partition map retains the expected reserved area. Reopen Windows Disk Management to compare the resulting layout with the plan. If the operation involved the system disk, also confirm Windows starts and that your backup and recovery options remain available.

If the result is different

Stop and capture the error or unexpected disk map before retrying. Check the drive's health, file system, encryption status and available capacity. If files are missing or the disk appears RAW, avoid writing to the volume and consider an image-based recovery workflow.

Free versus paid edition

Some advanced functions, especially OS migration, boot media and data recovery, may require a paid edition. Verify the current MiniTool comparison page. This page does not claim every shown operation is included in every edition, and it does not claim to have tested a particular PC or storage device.

Frequently asked questions

How do I understand Microsoft Reserved partition?

The Microsoft Reserved partition, or MSR, is a small GPT system partition used by Windows and should ordinarily remain untouched. Start by checking the disk layout and creating a verified backup before applying any changes.

Can this operation cause data loss?

Yes, any partition or filesystem change can have risks from incorrect disk selection, power loss or hardware errors. Removing MSR is not a safe way to gain meaningful storage capacity.

How can I tell if the result is correct?

The partition map retains the expected reserved area.

References and further reading

Related Windows guides

Need the Windows tool?

Verify the installer signature and choose the correct edition before modifying a disk.

Installation notes