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ERROR_DISK_QUOTA_EXCEEDED
What ERROR_DISK_QUOTA_EXCEEDED tells you
ERROR_DISK_QUOTA_EXCEEDED means the requested file-system operation would exceed an enforced storage quota. This is different from a volume simply being out of free space: the volume can have capacity remaining while the effective quota for the owning user or managed path blocks additional allocation.
Evidence to collect
- Record the failing path, operation, requested growth, file owner, volume, and the identity under which the write is charged.
- Determine which quota mechanism is enforcing the limit and capture its current usage, hard limit, and warning threshold.
- Check whether ownership changed, a redirected/profile path moved, or an application began writing under a different identity; quota accounting follows the configured ownership and quota model rather than the interactive user's expectation.
Recovery
Free quota-charged space, move data to an appropriate location, or raise the specific quota when policy permits. Do not disable quota enforcement for the entire volume merely to make one operation succeed. After the change, repeat the original write and verify both the file result and the quota accounting.
If the operation still fails after the effective quota has sufficient headroom, preserve the new error separately. Disk-full, access-denied, sharing, and file-system errors require different diagnosis.
Official references
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