Mirror Hard Disk in Windows 10/11 - Software Raid (2023)

Mirroring is writing to two hard drives at the same time, also known as Raid 1. Disk mirroring is primarily used to protect against disk failures.If one hard disk fails, the data is available on the second hard disk, the computer continues to work and you can start the configuration described here even after the failure.Duplicating the Windows partition is very easy, but do not set up the partitions to boot from the second hard drive in case of failure.This article is tooaccessibleifVideos from Youtube.


Some internet articles confuse mirroring with cloning, see also:Cloning, copying, imaging tools for hard drives. A mirror is something like the permanent cloning of the hard drive, i.e. the constant synchronization of both hard drives. For this reason, it would also be conceivable to clone a hard disk using “mirroring”. To do this, the mirror can be added and removed again as described here.

Windows includes a solution for mirroring disks. Also, many motherboard manufacturers offer the ability to mirror hard drives in the BIOS. In this case, the driver does the job and presents two mirrored drives as one to the operating system. Alternatively, mirroring can be set up in Windows when no version of Home is currently in use. Of course, this variant requires a little more system resources, but is hardware-independent.Disk mirroring in Windows is nothing new, Windows has been supporting it for decades.

Requirement: Dynamic disks

As a basis for mirroring, the hard disk must be converted into a dynamic disk. Originally, dynamic drives were an innovation, today they are more exotic and more of a relic from the past. Although the conversion of a BASIS hard disk to dynamic usually makes no difference in practice, the conversion should be considered briefly, as it cannot be easily reversed. reflect theThe Windows partition (c:) is initially a very simple thing and works almost by itself. Handling additional boot and system partitions is anything but self-explanatory. To prepare your computer for a primary hard drive failure, the system partitions must be created in the correct order. In order for the secondary hard disk to get the same partition IDs, it must first be dynamized last. Since mirroring drive C creates the partition on the second drive by itself, but it is not at the end of the drive by default, this is a chicken-and-egg problem. The only way I could solve the problem was to create a partition exactly the size of partition C on the second hard drive as a placeholder for the mirror and then delete it.

I originally described mirroring a legacy drive in this post. Since UEFI partition layouts are widely used today, I've adjusted the article. If you are still using legacy boot mode on your PC, you can change it to UEFI as follows:Change Windows 10 (Legacy) BIOS to UEFI Boot.

The easiest way to tell if EFI is being used is to use Disk Management. With UEFI, there is an EFI system partition at the beginning of the boot disk:

A prerequisite for mirroring the system drive is, of course, a second drive with sufficient storage space.

Setting up a Windows 10/11 mirror: UEFI boot

For a better overview I have summarized the individual steps:

additional diskInstall an additional hard drive with at least the same storage space
Initialize diskInitialize new disk with GPT: Type: Basic
create partitionsCreate additional disk partitions like the main disk
convert discsConvert both disks to dynamic disks.
Prepare the partition for mirroringDelete the placeholder partition again
add mirrorRight-click the main C drive
Fill the EFI partitionTransfer data from the primary EFI partition to the secondary drive
Fill recovery partitionTransfer data from the recovery partition to the secondary drive

Mirroring can be started from Disk Management:

When you launch Disk Management, the first thing you want to do is initialize the new disk for our mirror:

Mirror Hard Disk in Windows 10/11 - Software Raid (3)

(Video) Mirror hard disk in Windows 10/11 - Software Raid - Plex [Explained]

Mirror Hard Disk in Windows 10/11 - Software Raid (4)

The primary hard disk partitions can be read out in Windows PowerShell with the "get-partition -DiskNumber 0" command:

PS C:\Windows\system32> get-partition -DiskNumber 0 DiskPath: \\?\scsi#disk&ven_msft&prod_virtual_disk#5&32d19c0&0&000000#{53f56307-b6bf-11d0-94f2-00a0c91efb8b}PartitionNumber DriveLetter Offset Size Type------- - ------ ----------- ------ ---- ----1 1048576 100 MB Sistema2 105906176 16 MB Reservado3 C 122683392 126,29 GB Básico4 135722434560 611 MB Erholung

If the partitions or their sizes are different, this must be taken into account for the following commands.

If the disk has already been converted to dynamic, the command returns an error:

get-partition: No MSFT_Partition object with DiskNumber property equal to "0" was found. Check the property value and try again. Line: 1 Character: 1+ Get-Partition -DiskNumber 0+ ~~~~~~~~~~~~~~~~~~~~~~~ ~~~ ~~ + CategoryInfo: ObjectNotFound: (0 : UInt32 ) [Get-Partition], CimJobException + FullyQualifiedErrorId: CmdletizationQuery_NotFound_DiskNumber,Get-Partition

The reason: Windows still does not support dynamic disk management via Windows PowerShell.The solution is the command prompt with the good old command: diskpart. Here is the output of disk after converting to dynamic:

DISKPART> select disk 0Disk 0 is now the selected disk.DISKPART> list partition Partition ### Type Size Offset ------------- -------------- -- ------- ------- Partition 1 System 100MB 1024KB Partition 5 Dynamic Reserved 1024KB 101MB Partition 2 Reserved 15MB 102MB Partition 3 Dynamic Data 126GB 117MB Partition 4 Recovery 611 MB 126GB

Partition 5 was added when switching to dynamic: So "reserved" is 1MB smaller - 15MB instead of 16MB.

The secondary disk should not be switched to dynamic yet. If the disk is already dynamic, it can be converted to BASIC. To create the partitions, I compiled the following PowerShell commands:

Get-Partition -DiskNumber 1 | Remove-Partition #-Confirm:$FalseNew-Partition -DiskNumber 1 -Size 100MB -GptType "{c12a7328-f81f-11d2-ba4b-00a0c93ec93b}" New-Partition -DiskNumber 1 -Size 16MB -GptType "{e3c9e314-0b8.c - -817d-f92df00215ae}"Neue Partition -DiskNumber 1 -Size $($(get-volume | Where-Object DriveLetter -eq c).size)New Partition -DiskNumber 1 -GptType "{de94bba4-06d1-4d40 -a16a - bfd50179d6ac}" -Maximale Größe verwenden

The partition for C drive will be created the same as the main C partition and will only serve as a placeholder, so the recovery partition can be created now and will have the same ID as the main drive.

Mirror Hard Disk in Windows 10/11 - Software Raid (6)

As already mentioned, we switch hard disks to "dynamic" last, so that the layout of the partitions corresponds as closely as possible to the layout of the main hard disk.

Mirror Hard Disk in Windows 10/11 - Software Raid (7)

The future C partition or its mirror is in the middle, so by deleting the previously created partition we will have free space in the same position:

(Video) Mirroring / Software RAID 1 Resyncing Performance on Windows 10

Now comes the most important part, adding the reflection:

Windows now transfers all data blocks from drive C to the second drive in the background:

If both disks are synchronized, the status is shown as "Healthy":

Fill the EFI partition

So that the computer can also boot from the secondary disk later, I transfer all data from the EFI partition to the second disk partition

In Diskpart I assign the drive letter P. for the EFI partition of the primary disk: , for the partition of the secondary disk: S:

C:\Windows\system32>diskpartDISKPART> select disk 0 Disk 0 is now the selected disk.DISKPART> select partition 1Partition 1 is now the selected partition.DISKPART> assign letter=pDiskPart has successfully assigned drive letter or mount point.DISKPART > select disk 1Disk 1 is now the selected disk.DISKPART> select partition 1Partition 1 is now the selected partition.DISKPART> format fs=fat32 almost 100 percent doneDiskPart successfully formatted the volume.DISKPART> allocate letter= sDiskPart successfully assigned drive letter or mount point . exit

The BCD store can't be copied immediately, so I exported it, copied it and renamed it to BCD:

DISKPART> sairSaliendo de DiskPart...C:\Windows\system32>p:P:\>cd EFI\Microsoft\BootP:\EFI\Microsoft\Boot>bcdedit /export P:\EFI\Microsoft\Boot\BCD2P:\ EFI \Microsoft\Boot>robocopy p:\ s:\ /e /r:0P:\EFI\Microsoft\Boot>renomear S:\EFI\Microsoft\Boot\BCD2 BCDP:\EFI\Microsoft\Boot>del P: \ EFI\Microsoft\Boot\BCD2

(see: https://learn.microsoft.com/en-us/troubleshoot/windows-server/backup-and-storage/set-up-dynamic-boot-partition-mirroring)

The following commands delete the previously used drive letters P and S again:

(Video) Configure RAID in Windows 10 (Storage Spaces)

P:\EFI\Microsoft\Boot>c:C:\Windows\System32>diskpartMicrosoft DiskPart Version 10.0.22000.1DISKPART> select volume sDISKPART> removeDISKPART> select volume DISKPART> select volume pDISKPART> removeDiskPart successfully removed the drive letter or mount point.

Fill recovery partition

The following commands can be used to transfer the contents of the recovery partition from disk 0 to disk 1.Therefore, the drive letters must be reassigned for access.


DISKPART> select disk 0Disk 0 is now the selected disk.DISKPART> list partition Partition ### Type Size Offset ------------- -------------- -- ------- ------- Partition 1 System 100MB 1024KB Partition 5 Dynamic Reserved 1024KB 101MB Partition 2 Reserved 15MB 102MB Partition 3 Dynamic Data 126GB 117MB Partition 4 Recovery 611 MB 126 GBDISKPART> select partition 4Partition 4 is now the selected partition.DISKPART> assign letter=pDiskPart has successfully assigned the drive letter or mount point.DISKPART> select disk 1Disk 1 is now the selected disk .DISKPART> list partition Partition ### Type Size Offset ------------- ----------------------- - ----- - Partition 1 System 100MB 1024 KB Partition 5 Dynamic Reserved 1024 KB 101 MB Partition 2 Reserved 15 MB 102 MB Partition 3 Dynamic Data 126 GB 117 MB Partition 4 Recovery 612 MB 126 GBDISKPART > Select Partition 4 Partition 4 is now the selected partition DISKPART> fast format fs = ntfs lab el="winRE"DISKPART> assign letter=sexitc:\windows\sy stem32> robocopy p:\ s:\ /e /r:0

Finally, the drive letters can be removed again:

C:\WINDOWS\system32>diskpartMicrosoft DiskPart Version 10.0.22000.653Copyright (C) Microsoft Corporation. On the computer: TESTDISKPART > select volume sVolume 2 is the selected volume.DISKPART > removeDiskPart successfully removed the drive letter or mount point. .DISKPART> select volume pVolume 4 is the selected volume.DISKPART> removeDiskPart removed by clicking on the drive letter or mount point.

If everything works so far and the C partition is in sync, even the main drive can be erased. The secondary disk reports an error, but the computer can still be started with "F9".

Worst case: failure of the primary drive.

To simulate a drive failure, I removed the primary drive and set the boot order in the BIOS to the second drive.


I've tried a few things... I have tried the procedure described here several times. If you follow all the steps outlined in creating it, you should beable to start the computer with F9 at this point. If the PC still won't boot, the Windows setup media can be used to boot or repair the EFI partition:Windows 10/11 – Descarga Installation – Boot-DVD oder USB. With the Windows bootable media, it is even possible to create an EFI system partition for booting later. The EFI partition only needs to find space on the first 2.2 TB of the boot disk. For EFI partition creation information, see:Change Windows 10 (Legacy) BIOS to UEFI Boot.

After starting the PC, Disk Management shows us the lost disk:

Mirror Hard Disk in Windows 10/11 - Software Raid (17)

If the disk is permanently unavailable, it can be permanently deleted with "Delete Mirror":

Mirror Hard Disk in Windows 10/11 - Software Raid (18)

(Video) How to create disk Mirror in Windows 10 (RAID 1)

Mirror Hard Disk in Windows 10/11 - Software Raid (19)Mirror Hard Disk in Windows 10/11 - Software Raid (20)

In principle, we return to the beginning of the article so that an additional hard disk can be used for duplication again:

Mirror Hard Disk in Windows 10/11 - Software Raid (21)

startup repair

So that the computer does not boot permanently with F9, I repaired the boot files with bcdboot:

c:\windows\system32> diskpartDISKPART> select disk 0DISKPART> select partition 1DISKPART> Assign letter=y:exity:cd EFI\BootY:\EFI\Boot>bcdboot c:\windows /s y: /f UEFIBoot files created successfully.

Mirror Hard Disk in Windows 10/11 - Software Raid (23)

Videos from Youtube

The content of this article is covered in the following YouTube video:

Frequently Asked Questions

What is disk mirroring?

With disk mirroring, data is written simultaneously to two disks, also called RAID1. The content of both hard drives is always identical.

What is the difference between disk cloning and disk mirroring?

The difference between cloning and mirroring is that cloning is a one-time transfer of the content to another hard drive. With mirroring, on the other hand, content is written to two hard disks simultaneously during operation. Two hard drives are installed and permanently synchronized so that the second hard drive can take over in the event of a failure. When cloning a hard drive, a second hard drive is usually only temporarily added to replace the original hard drive with another one or to create a backup.


Mirroring system disks in Windows 10/11 increases PC availability and even protects against itcomplete failure of the primary hard drive.In addition, disk mirroring provides the ability to transfer data from one disk to another in real-time, similar to disk cloning:Clone disk, copy disk, create image, tools..


Which RAID has disk mirroring? ›

RAID Level 1 – Mirroring uses equal amounts of disk capacity to store data and a copy (mirror) of the data. Data is duplicated, or mirrored, over two or more physical disks.

How do I mirror a disk in Windows 11? ›

To create a mirror volume on Windows 11 with the Disk Management tool, use these steps:
  1. Open Start.
  2. Search for "Create and format hard disk" and click the top result to open the Disk Management app.
  3. Right-click the "Unallocated" drive space and select the New Mirrored Volume option.
Aug 23, 2022

Does Windows 11 support RAID? ›

Windows 11 has the same resiliency settings as Windows 10, but in Windows 11, they added double parity from RAID 6.

How to mirror the system and boot partition raid1 in Windows 10? ›

Mirror the boot and system volume

Right-click disk 0 (which contains the boot and system files), and then click Add Mirror. A dialog box opens in which any disk on your system that is available for mirroring is displayed. Select the disk of your choice (in this example, it is disk 1), and then click Add Mirror.

Does RAID 10 have mirroring? ›

RAID 10, also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data. It requires a minimum of four disks and stripes data across mirrored pairs. As long as one disk in each mirrored pair is functional, data can be retrieved.

Does RAID 5 use mirroring? ›

RAID 5 does not support mirroring and redundancy.

Does Windows 11 have disk cloning software? ›

MiniTool ShadowMaker – Best Free Cloning Software Windows 11

The software should be able to help you transfer disk data to another disk, clone Windows 11 to SSD or clone a hard drive to another for backup or disk upgrade while making sure the data's integrity.

Does Windows 11 have mirroring? ›

Windows 11 will scan and show your smart TV under available wireless displays. Click on your Samsung Smart TV to add the device. Once connected, Windows 11 will start mirroring your display to your Samsung smart TV.

How do I make a mirror image of my hard drive? ›

Install two identical drives, convert them both to dynamic disks, designate the secondary drive as a mirror and Windows will write the exact same information to both drives, creating a mirror image. If one of the two drives fails, the system continues using the other drive and there is no downtime for users.

How do I install Windows 11 in RAID mode? ›

1) Create the RAID inside of your motherboards raid controller settings. 2) Run the installation through normal means so the with the Media creation tool created USB. During drive selection if necessary click "load driver" and load the necessary driver for your RAID controller.

Does Windows support software RAID? ›

Implementing Software RAID on a Windows Computer

Software RAID is easy to implement on Windows 11, Windows 10, and even Windows 8. Thanks to Microsoft's Storage Spaces, the process of combining multiple hard drives into a disk array is rather straightforward.

How do I check my RAID status Windows 11? ›

To view the RAID status, go to System Settings > RAID Management. The RAID Management pane displays the RAID level, status, and disk space usage. It also shows the status, size, and model of each disk in the RAID array.

What is difference between RAID and mirroring? ›

Mirroring is another form of RAID – RAID-1 for the purist. Mirroring consists of at least 2 disk drives that duplicate the storage of data. More frequently, you will see 2 or disk units on each array so duplicate data is sent to the second array of disks.

Does RAID 1 use mirroring? ›

RAID 1. RAID 1 is based on disk mirroring or duplexing. Data that's written to one disk is also written to another, so that each disk has an exact copy of the data and one disk's data is a mirror image of the other's. If one of the physical disks fails, the server can continue operating by using the other disk.

Is RAID 1 mirrored or striped? ›

Common RAID Levels

RAID 1: Mirrored Set – creates a mirror or exact copy of a set of data onto two or more disks, providing protection against a single disk failure. RAID 0+1: Mirror of Stripes –a RAID level used for sharing and replicating data among multiple disks.

Is RAID 5 mirrored or striped? ›

RAID 5 is a redundant array of independent disks configuration that uses disk striping with parity. Because data and parity are striped evenly across all of the disks, no single disk is a bottleneck. Striping also allows users to reconstruct data in case of a disk failure.

Does RAID 10 need identical drives? ›

The only absolute requirement for matching drive specs in a RAID 10 array is that the drives must be of the same architecture, e.g., all SAS or SATA.

Does RAID 0 use mirroring? ›

RAID 0 offers striping with no parity or mirroring. Striping means data is "split" evenly across two or more disks.

Is RAID 6 mirrored or striped? ›

Block-level striping with double distributed parity. Both the data and the parity information are striped across all drives in the RAID 6 group, and redundancy information is duplicated.

Can I break a RAID 1 mirror without losing data? ›

RAID 1 (Mirror) volumes can be deleted without losing data if the RAID 1 volume is: The only volume on the drives.

Why is RAID 5 not recommended? ›

Dell recommends not using RAID 5 for any business-critical data. RAID 5 carries higher risks of encountering an uncorrectable drive error during a rebuild, and therefore does not offer optimal data protection.

Can you clone a hard drive from Windows 10 to Windows 11? ›

We've introduced how to use EaseUS Partition Master in this article. This software also can clone hard drive from Windows 10 to Windows 11. If you want to upgrade your computer from the old OS version to the newest one. Don't hesitate.

Does Windows have built in cloning software? ›

Windows 10 comes with a built-in tool called System Image to help transfer your hard drive. System Image only works if you are cloning your hard drive to a larger hard drive, so you can't use it to clone hard drive partitions.

Does Windows 11 have a migration tool? ›

You will need to use the Windows 11 migration tool with 2 common situations below. Migrate data to a new Windows 11 computer: If you plan to upgrade your system to Windows 11 or you want to purchase a new Windows 11 computer, and you still want to keep all your previous data, the migration tool can help you.

How do I use Scrcpy in Windows 11? ›

Connect your phone to your PC via USB cable. Confirm the USB Debugging permission on Android via pop-up. Run the Scrcpy on Command Prompt. That's it!

How do I use Smart View in Windows 11? ›

On your Windows 11, go to the Settings > Bluetooth & other devices. On the other hand, on your Android phone, show the Notification panel, turn on the Bluetooth and tap the Smart View > choose your Windows 11 from the list to start casting your Android phone to your Windows 11.

What is cast Windows 11? ›

You can cast Windows 11 to TV using the HDMI cable. Connect cable from both ends with the PC and the TV and select the HDMI from the TV source. Windows 11 also supports Miracast for screen mirroring wirelessly.

Is mirroring the same as cloning? ›

Mirror backups are not the same as Imaging or Cloning. Mirror backups are meant to copy only files and folders, so that if you lose those particular files you can easily restore them. Imaging/Cloning on the other side create exact replicas of everything on your computer's hard drive.

Can you mirror a hard drive? ›

A full image backup, or mirror backup, is an exact replica of everything on your computer's hard drive, from the operating system, boot information, apps, and hidden files to your preferences and settings. Imaging software not only captures individual files, but everything you need to get your system running again.

What is the difference between clone and mirror? ›

In a lot of ways, a mirror backup is essentially the same thing as disk cloning (both copy everything from the computer). Disk cloning allows you to transfer data from one hard drive to another, while mirror backups store your data and compress it to just a few small files for when you're ready to access it again.

Does Windows 10 have built in RAID? ›

No, Windows 10 does not have a built-in RAID. However, Windows 10 and 8 do have a feature known as Storage Spaces that allows you to combine multiple HDDs or SSDs into a single RAID array.

What is the difference between AHCI and RAID in Windows 11? ›

AHCI vs RAID: Advantages of RAID

RAID provides redundancy, meaning that if one disk fails, the others can continue to operate. This is not the case with AHCI, which will experience data loss if a disk fails. RAID can also improve performance by striping data across multiple disks.

Can I configure RAID after Windows installation? ›

RAID configuration is most often completed before you install an operating system and for the boot disk. However, you can to create a RAID volume on other non-boot disks after installing an operating system.

Is hardware RAID or software RAID better? ›

Hardware RAID generally costs more than software RAID but may offer better performance.

Which are the limitations of software RAID? ›

  • Software RAID is often specific to the OS being used, so it can't generally be used for drive arrays that are shared between operating systems.
  • You'll be restricted to the RAID levels your specific OS can support.
  • Performance hit if you're using more complex RAID configurations.
Mar 6, 2018

Can RAID be implemented in software? ›

Software RAID can be implemented in a variety of ways: 1) as a pure software solution, or 2) as a hybrid solution that includes some hardware designed to increase performance and reduce system CPU overhead. In this case, the RAID implementation is an application running on the host without any additional hardware.

How do you check if a drive is raided? ›

To view the RAID status, go to System Settings > RAID Management. The RAID Management pane displays the RAID level, status, and disk space usage. It also shows the status, size, and model of each disk in the RAID array.

Should I have RAID enabled? ›

When Should I Use RAID? RAID is extremely useful if uptime and availability are important to you or your business. Backups will help insure you from a catastrophic data loss. But, restoring large amounts of data, like when you experience a drive failure, can take many hours to perform.

How does software RAID work? ›

Software RAID is a form of RAID (redundant array of independent disks) performed on the internal server. RAID is a data protection method that spreads data on multiple hard disks, balancing overlapping I/O operations, improving performance and increasing the mean time between failures.

Which RAID mode is best? ›

The best RAID configuration for your storage system will depend on whether you value speed, data redundancy or both. If you value speed most of all, choose RAID 0. If you value data redundancy most of all, remember that the following drive configurations are fault-tolerant: RAID 1, RAID 5, RAID 6 and RAID 10.

What is the advantage of disk mirroring? ›

In addition to providing an additional copy of the data for the purpose of redundancy in case of hardware failure, disk mirroring can allow each disk to be accessed separately for reading purposes.

What is the disadvantage of using the RAID mirroring technique? ›

That means mirroring and striping are done in one single RAID array.
RAID 10 (RAID 1+0) – Mirroring and Striping.
Advantages and Disadvantages of RAID 10
Combination of mirroring and striping makes it fast and resilient.It is expensive
Mirroring makes RAID 10 secureLimited scalability
Jan 5, 2023

When should you use RAID vs RAID 1? ›

When choosing between RAID 1 and RAID 0, organizations must decide what is the most important to them: performance, capacity or fault tolerance. RAID 0 offers the best performance and capacity but no fault tolerance. Conversely, RAID 1 offers fault tolerance but does not offer any capacity of performance benefits.

Does RAID 1 have mirroring? ›

RAID 1. RAID 1 is based on disk mirroring or duplexing. Data that's written to one disk is also written to another, so that each disk has an exact copy of the data and one disk's data is a mirror image of the other's. If one of the physical disks fails, the server can continue operating by using the other disk.

Is RAID 0 disk mirroring? ›

In RAID 0 technology, Disk stripping is used. While in RAID 1 technology, Disk mirroring is used.


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