If you're considering setting up a RAID system in Windows 11 , the good news is that the operating system includes native tools for creating software arrays without relying on dedicated controllers. With the arrival of the modern interface (WinUI) in the Settings app, in addition to the classic Control Panel, it's easier to configure, expand, and maintain these volumes.
In this practical guide you will find detailed information on where to activate Storage Spaces, what types of resilience it supports (including dual parity), how to create a group and its space, what to consider before starting, how to replace a failed disk, delete the group if you no longer need it, and what options are available to recover data if something goes wrong.
What is a RAID system and what does Windows 11 offer?
RAID ( Redundant Array of Independent Disks ) is a way to combine multiple physical drives to improve performance, capacity, and/or fault tolerance. Windows 11 natively supports software RAID, with two main approaches: the Storage Spaces feature (recommended) and, in specific scenarios, dynamic disks/Disk Management or BIOS/UEFI-level configuration.
There are two ways to access Storage Spaces in Windows 11:
- The classic implementation of the Control Panel.
- The new WinUI interface within Settings.
Both allow you to create and manage disk pools (groups) and their spaces (volumes). The WinUI view adds a very interesting functional improvement: the dual parity option.
Resilience types (configurations) available when you create a space in Windows 11:
- Simple: equivalent to RAID 0 (striping), with no fault tolerance. Requires at least two disks.
- Bi-directional mirror: equivalent to RAID 1 (mirroring), tolerates one disk failure. Requires at least two.
- Three-way mirror: Triple mirror; some sources equate it with RAID 1E. The reviewed material indicates that it requires at least five disks and combines data striping for performance and triple copying for resilience.
- Parity: equivalent to RAID 5, fault tolerance with minimum 3 disks.
- Dual parity: equivalent to RAID 6, tolerance to two simultaneous failures; requires at least 5 disks.
As a general rule , choose mirror if you want maximum simplicity and fast recovery, parity if you're looking for capacity efficiency with protection, and dual parity if availability is critical and you have enough disks.
Before Creating RAID: Important Requirements and Warnings
- The disks you are going to use must be “unallocated” and without volumes. If they appear partitioned today, open Disk Management (right-click Start → Disk Management) and delete the existing volumes on those drives until they are all unallocated space.
- Back up any data that remains on the affected disks: the creation process wipes partitions and formats them. Everything on them will be erased, and recovery can only be attempted with data recovery tools.
- Avoid mixing drives with different logical sector sizes (512e vs 4K native/4Kn). Windows 11 and Storage Spaces may fail when combining disks with different sector sizes. Check the size with the command: fsutil fsinfo ntfsinfo X: (replace X: with the drive letter) and check “Bytes per sector” and “Bytes per physical sector”.
- If you detect different sector sizes, the consulted material suggests unifying to 4K using third-party utilities such as MiniTool Partition Wizard or NIUBI Partition Editor, and then rebooting before creating the pool.
Create a pool and its storage space
These are the steps to follow:
- Create the group From Storage Spaces (Settings/Control Panel) with the option "Create a new pool and storage space." Select the physical disks that will be part of the pool. Keep in mind that they will no longer be used individually.
- Defines the first storage space within the newly created pool. Assign a name, choose the resiliency type (for example, Two-Way Mirror for RAID 1), and set a size. You can create multiple spaces on the same pool if needed.
- Label and drive letter: Assign a label, drive letter, and file system (NTFS is usually recommended for Windows). Under “Advanced Options,” you can adjust the cluster size if you’re working with large files (e.g., 64 KB or more for content larger than 1 MB).
- Formatting and availability: Once complete, the space will appear in Explorer as a normal drive, ready for use. From the Storage Spaces console, you can check the status, used/free capacity, and intervene if anything goes wrong.
Choosing the right type of resilience and size
Effective capacity and number of disks depend on resilience. Parity (RAID 5) requires a minimum of 3 disks; dual parity (RAID 6), a minimum of 5; two-way mirroring, 2; and three-way mirroring, a larger array (references indicate 5). Evaluate availability and cost before deciding.
If you combine drives of different sizes , the usable capacity is usually limited by the smallest drive. For example, in a 2 TB + 1 TB mirror, the portion exceeding the 2 TB drive will go unused; this waste is also noticeable in parity configurations.
The "Simple" type (striping/RAID 0) increases performance and capacity, but does not protect against failures: if one disk fails, you lose the entire volume. It is useful for temporary data or scenarios where recovery is not a priority.
RAID 1 in Windows 11 with Storage Spaces
For a classic mirror (RAID 1) , choose "Bidirectional Mirror" when creating the space, assign a drive letter, and format it as NTFS. This configuration keeps identical copies of your data on both drives, allowing you to continue working if one fails.
Windows 11 prioritizes Storage Spaces over dynamic disks. The "New Mirrored Volume" option in Disk Management only appears if you convert to dynamic disks, and in many modern builds, its support is limited. Therefore, for software RAID 1, Storage Spaces is the recommended approach.
Common mistakes and how to fix them
1) Incompatible sector sizes (512e vs 4Kn) : As mentioned, do not mix drives with different logical sectors. Verify this with fsutil. If they differ, consider converting to 4K using specialized utilities and restarting before creating the pool.
2) Disks do not appear or cannot be added : In Disk Management, ensure they are "Unallocated". If they are still not detected, try different SATA ports, cables, or update the BIOS/UEFI.
3) Creation fails in Disk Management : In Windows 11, certain editions restrict the creation of the "mirrored volume" from Disk Management. Try directly using Storage Spaces from Control Panel/Settings.
Replacing a damaged disk in the pool
When Windows detects problems with a drive in the storage pool, you'll see warnings in the Storage Spaces section and messages about degraded performance. Identify the affected disk in the "Physical Disks" section.
If you're using the minimum number of disks for that resilience, first add a new drive to the pool (using the "Add disks to storage pool" option), check the box for the new disk, and confirm. Then, on the failed disk, go to "Properties," choose "Prepare for disposal," and then "Delete."
Once you complete the operation , you will be able to physically remove the defective disk from the computer without compromising the integrity of the storage space.
Delete a storage space and its group
If you need to free up disks for individual use or in another pool, first delete all existing storage spaces from their “Properties” → “Delete”.
Next, remove each disk from the pool by going to the physical disk's "Properties" → "Prepare for Deletion" → "Delete". Once the last disk has been removed, the pool will be automatically deleted.
Which drives to choose and hardware considerations
For large storage volumes at a good price, hard disk drives (HDDs) remain a balanced option in terms of cost/capacity and tend to run cooler than some SSDs. If speed is your priority, SSDs are a viable option, and with expansion cards you can add more M.2 drives, although you may sometimes have to occupy the PCIe x16 slot.
Consumer motherboards typically offer native support for RAID 0 and RAID 1. Intel chipsets sometimes also support RAID 5, while AMD offers less common RAID 5. More advanced configurations require specific controllers or dedicated solutions such as NAS/DAS.
Quick questions to make a good choice
- Looking for simple and fast protection? Two-way mirror (RAID 1). Two disks and you're done.
- Do you want capacity efficiency with protection? Parity (RAID 5) if you have at least three disks; dual parity (RAID 3) if you prioritize survival against double failures and have five or more.
- Do you need pure speed and aren't worried about risk? Simple Type (RAID 0), knowing that a failure means losing the volume.
- Does your motherboard support BIOS RAID? Consider this if you want the array to be independent of Windows and, for example, host the system itself on the array.
With all of the above as a guide , Windows 11 allows you to set up powerful software RAID arrays with Storage Spaces, take advantage of dual parity in the modern interface, resolve typical incompatibilities (512e vs 4Kn sectors), hot-swap disks within the pool, and, if you prefer, opt for BIOS/UEFI solutions or dedicated hardware for more demanding scenarios.
