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NS_E_CANNOTOFFLINEDISK
NS_E_CANNOTOFFLINEDISK: Content Server disk state
NS_E_CANNOTOFFLINEDISK (0xC00D0009) means Windows Media Services could not take the selected Content Server disk offline.
Evidence to preserve
Capture the disk UID, current online/rebuild/restripe state, titles or sessions using the member, outstanding management operation, and any lower-level refusal returned for the offline request.
How to interpret it
The disk may be healthy but still unavailable for an offline transition because another lifecycle operation or active owner prevents it.
Recovery and verification
Identify and finish the operation that owns the disk, then retry the offline transition for the same UID. Do not force unrelated disks offline to work around this state conflict.
Technical references
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