If you want to protect your data from drive failures without using expensive hardware RAID controllers, Windows 11 gives you the ability to set up RAID 1 directly through its built-in Storage Spaces feature. RAID 1—also known as disk mirroring—creates an identical copy of your data across two drives. So if one drive fails, your data remains safe on the other. It’s one of the simplest and most effective ways to add redundancy to your system, especially for important files and work projects.
In this guide, we’ll show you how to configure RAID 1 on Windows 11 using Storage Spaces, check the health of your mirrored drives, and understand the limitations you should keep in mind before setting everything up.
Configure RAID 1 on Windows 11
To configure RAID 1 on Windows 11, you’ll need two internal or external drives of the same size—or at least the same usable capacity—to ensure proper mirroring. It’s best to use new or freshly formatted drives, since any existing data will be erased during setup. You’ll also need administrator privileges on your PC so you can create and manage Storage Spaces.
Finally, make sure you have a reliable power source and a backup of any important files before creating your RAID array, as the process rewrites both drives during configuration.
1. Open Storage Spaces on Windows 11
Windows 11 handles RAID-like configurations through the Storage Spaces tool.
- Press Windows + I to open Settings.
- Click System on the left sidebar.
- Scroll down and select Storage.
- Click Advanced storage settings.
- Choose Storage Spaces.
This is where you’ll create and manage mirrored drives.
2. Create a New Storage Pool
A storage pool is a collection of physical drives that Windows uses to build RAID configurations.
- Click Create a storage pool.
- Windows will scan for available drives.
- Check the boxes next to the two drives you want to use for RAID 1.
- Click Create pool.
Note: All data on these drives will be erased during pooling.
3. Choose RAID 1 (Two-Way Mirror) and Create the Storage Space
Once your drives are in a pool, you can set the redundancy type.
- In the Name and resiliency section, enter a name for your storage space.
- Choose a drive letter if desired.
- Under Resiliency, select Two-way mirror—this is Windows’ version of RAID 1.
- Set the storage space size. It should be equal to or less than the capacity of your smallest drive.
- Click Create.
Windows will now set up the RAID 1 mirror and mount it as a new drive.
4. Verify That RAID 1 Is Active
After creation, it’s good practice to confirm everything is working correctly.
- Open File Explorer.
- Look for the new drive letter you assigned.
- Right-click the drive and choose Properties.
- The drive should show the total capacity equal to a single drive, not both.
- Go back to Storage Spaces to confirm the status shows OK or Healthy.
If both drives are listed as healthy, your RAID 1 array is functioning.
5. Check Drive Health and Redundancy Over Time
Storage Spaces includes built-in checks to monitor drive status.
- Return to Storage Spaces under Advanced storage settings.
- Expand your storage pool.
- Each drive will show a status indicator such as OK, Warning, or Error.
- If a drive begins failing, Windows will alert you and recommend replacement.
RAID 1 helps protect your data by keeping everything mirrored, but it’s still important to monitor drive health regularly.
6. Replace a Failed Drive in RAID 1 (If Needed)
If a drive fails, you can rebuild the mirror without losing data.
- Disconnect the failed drive and install a replacement of equal or larger size.
- Go to Storage Spaces.
- Click Add drives under your pool.
- Select the new drive and add it to the pool.
- Click Optimize or Repair to rebuild the mirror.
Windows will automatically copy your data and restore full redundancy.
Wrapping Up
Configuring RAID 1 on Windows 11 is one of the easiest ways to add an extra layer of data protection without needing specialized hardware. With Storage Spaces, Windows handles the mirroring automatically, ensuring your files stay safe even if one drive fails.
Once your RAID 1 array is set up, you can use it like any normal drive while still benefiting from real-time data redundancy.
