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How to resize RAID 1 partition on Windows Server without destroying data?

Updated on Dec 19, 2018 by Tracy King to Partition Master

This article introduces the best solution to resize RAID 1 partition without destroying data in Windows 2000/XP/Vista/Windows 7/Windows 8 and Windows Server 2000/2003/2008 32bit and 64bit.

Why do computer servers, especially Server users need to repartition RAID? Generally speaking, they need to repartition RAID regularly to optimize the usage of their server computers. A typical example is the system partition on the hardware RAID is running out of space. By the traditional method, you have to back up the files, delete the partitions, rebuild the hardware RAID and restore the data. What a time-consuming task!

Generally, if the Operating System installs on RAID 1, so this low disk space problem often occurs on RAID 1. This article will tell you more about RAID 1 and give you the best solution to resize RAID 1 partition directly and safely.

What is RAID 1

RAID 1 - Disk mirroring. Optimized for Redundancy

RAID 1 uses mirroring to write data to multiple drives. It means that when you write a file, the data is actually written to two disks. If one of the disks fails, you can replace it and rebuild the mirror.

The tradeoff with RAID 1 is cost. With RAID 1, you must purchase double the amount of storage space that your data requires.

Minimum number of drives: 2

Strengths: Very high performance; Very high data protection.

Weaknesses: High redundancy cost overhead. All data is duplicated, twice the storage capacity is required.

Problem: System partition space is low

If the system partition is out of space, you'll find that it is beef-witted and you cannot install any other applications. Moreover, you cannot defrag the partition, impossible to upgrade the operating system. The most important, there is a huge risk of a system crash.

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 Server 2016 is supported

Is it possible to resize RAID 1 system partition safely and easily? The answer is yes, and this article will introduce a great solution to resize RAID 1 partitions directly and quickly without destroying data. After you build a RAID array, the virtual disk is detected by Windows as a physical hard disk, no matter which RAID array you built. If you encountered this problem, you'd better follow the steps below to resize the RAID 1 partition immediately.

How to resize RAID 1 partition

Download and install EaseUS Partition Master Server.


Step 1: Run EaseUS Partition Master

Run Server partition manager

Step 2: Resize Server Partition

1. To shrink a Server partition:

  • Right-click a partition which you want to shrink and select "Resize/Move".
Resize partition size to free up space
  • Drag the partition handle leftward to shink partition and click "OK" to continue.
Extend Server Partition

2. To extend a Server partition

Repeat 1 to free up unllocated space on the Windows Server disk, and continue with tips below to extend a Server partition.

  • Right-click partition next to the unallocated space, select "Resize/Move".
  • Drag the partition rightward or leftward to move unallocated space next to the target partition.
  • Click "OK".
  • Right-click on the target Server partition, select "Resize/Move" and drag the partition into the unallocated space.
  • Click "OK" to continue.
Extend Server Partition

Step 3: Apply and keep all changes

Click the "Execute Operation" button and click "Apply" to keep all changes.