Event ID 304: The NTFS volume dismount failed

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The NTFS volume dismount failed.

Event 304

Ntfs

System log

Error

Message and fields (as Event Viewer shows them)

The NTFS volume dismount failed.

           Volume correlation Id: …
           Volume name: …
           Volume label: …

           Device name: …
           Device GUID: …
           Device manufacturer: …
           Device model: …
           Device revision: …
           Device serial number: …
           Bus type: …
           Native NVMe: …
           
           Adapter serial number: …
           
           Error:…

The Kerberos client used the DES algorithm to encrypt data.

Event 304

Security-Kerberos

System log

Warning

Message and fields (as Event Viewer shows them)

The Kerberos client used the DES algorithm to encrypt data. This is unsupported with Credential Guard.

Task Scheduler sent "…" task to Task Engine "…" .

Event 304

TaskScheduler

TaskScheduler/Operational log

Information

Message and fields (as Event Viewer shows them)

Task Scheduler sent "…"  task to Task Engine "…" . The task instance Id is "…" .

The service is shutting down.

Event 304

Bits-Client

Bits-Client/Operational log

Verbose

Message and fields (as Event Viewer shows them)

The service is shutting down.