This tutorial will show you how to add a disk drive to an existing Storage Pool to increase its capacity in Windows 11.
Storage Spaces helps protect your data from drive failures and extend storage over time as you add drives to your PC. You can use Storage Spaces to group two or more drives together in a storage pool and then use capacity from that pool to create virtual drives called storage spaces. These storage spaces typically store two copies of your data so if one of your drives fails, you still have an intact copy of your data. If you run low on capacity, just add more drives to the storage pool.
Reference:
Storage Spaces in Windows - Microsoft Support
Learn how to create new storage spaces, choose between mirror, two-way, and parity spaces, optimize drive usage, and remove a drive from a pool.

You must be signed in as an administrator to add a drive to a storage pool.
Here's How:
1 Open Settings (Win+I).
2 Click/tap on System on the left side, and click/tap on Storage on the right side. (see screenshot below)
3 Click/tap on Advanced storage settings to expand it open, and click/tap on Storage Spaces. (see screenshot below)
4 Click/tap on the Storage Pool name (ex: "Storage Pool") you want to add a drive to. (see screenshot below)
5 Under Physical Disks, click/tap on the Add a disk button. (see screenshot below)
6 Perform the following steps to select and add disk(s) to this storage pool: (see screenshot below)
Disks you select to add to this storage pool will get formatted.
- Select (check) any available disk(s) you want to add to this storage pool.
- Check Optimize disk usage by spreading existing data across all disks in the pool.
- Click/tap on Add.
7 You can now close Settings if you like.
That's it,
Shawn Brink
Related Tutorials
- Create New Storage Pool of Storage Spaces in Windows 11
- Delete Storage Pool of Storage Spaces in Windows 11
- Rename Storage Pool of Storage Spaces in Windows 11
- Rename Physical Disks in Storage Pool of Storage Spaces in Windows 11
- Remove Drive from Storage Pool of Storage Spaces in Windows 11
- Add Storage Space to Storage Pool in Windows 11
- Extend Storage Space Size in Storage Pool in Windows 11
- Connect or Disconnect Storage Spaces in Storage Pool in Windows 11
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- Optimize Storage Pool of Storage Spaces in Windows 11
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