What causes storage spaces not working or pool degraded on Windows?

Common causes of storage spaces not working or pool degraded include: One or more physical drives in the pool have failed, Drive connection issues (USB/SATA cable or port failure), Storage Spaces service not running properly, Pool metadata corrupted after unexpected shutdown, Insufficient physical drives for selected resiliency type, Drive firmware or controller compatibility issues.

How do I know if I have storage spaces not working or pool degraded issues?

Common symptoms of storage spaces not working or pool degraded include: Storage pool shows "Degraded" or "Failed" status, Can't create a new storage pool — errors during creation, Storage Space drive not accessible or shows as RAW, Storage Spaces reports insufficient capacity despite free space, Drives dropped from pool unexpectedly, Storage Space extremely slow read/write performance.

Fix Storage Spaces Not Working or Pool Degraded

Symptoms

You might be experiencing this problem if you notice:

•Storage pool shows "Degraded" or "Failed" status
•Can't create a new storage pool — errors during creation
•Storage Space drive not accessible or shows as RAW
•Storage Spaces reports insufficient capacity despite free space
•Drives dropped from pool unexpectedly
•Storage Space extremely slow read/write performance

Common Causes

⚠One or more physical drives in the pool have failed
⚠Drive connection issues (USB/SATA cable or port failure)
⚠Storage Spaces service not running properly
⚠Pool metadata corrupted after unexpected shutdown
⚠Insufficient physical drives for selected resiliency type
⚠Drive firmware or controller compatibility issues

Solutions

Solution 1: Check Pool Health and Repair

1Open Storage Spaces:
2Settings → System → Storage → Advanced storage settings → Storage Spaces
3Or: Control Panel → Storage Spaces
4Check pool status — look for warnings on individual drives
5If a drive shows warning/error:
6Check physical connections (reseat SATA/USB cables)
7Try a different port on the motherboard
8If drive failed: replace it with a new drive of equal or greater size
9Click "Add drives" → select replacement drive
10Pool will rebuild automatically (can take hours)

Solution 2: Fix Storage Spaces Service

1Ensure required services are running:
2services.msc → find "Storage Service" → Start type: Manual
3Also check: "Storage Tiers Management" service
4PowerShell as Admin — check pool status:
5Get-StoragePool | Format-List FriendlyName,HealthStatus,OperationalStatus
6Get-PhysicalDisk | Format-List FriendlyName,HealthStatus,OperationalStatus
7If pool shows "Read-Only":
8Set-StoragePool -FriendlyName "YourPoolName" -IsReadOnly $false
9If virtual disk degraded:
10Repair-VirtualDisk -FriendlyName "YourDiskName"

Solution 3: Recover Data from Failed Pool

1If pool is completely inaccessible:
2Do NOT format or delete the pool drives
3Try: PowerShell as Admin:
4Get-StoragePool -IsPrimordial $false | Get-VirtualDisk
5If virtual disks visible but detached:
6Connect-VirtualDisk -FriendlyName "YourDiskName"
7If pool metadata is corrupt:
8Data recovery from Storage Spaces requires professional tools
9ReclaiMe Storage Spaces Recovery is a specialized tool for this
10For mirrored spaces: individual drives may contain recoverable data
11Consider professional data recovery service for critical data

FIXES THIS IN 5 MINUTES