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Event ID 505: Performance summary for Storport Device (Port = …, Path = …, Target = …, Lun = …) whose Corresponding Class Disk Device Guid is …:

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.

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Performance summary for Storport Device (Port = …, Path = …, Target = …, Lun = …) whose Corresponding Class Disk Device Guid is …:

Event 505
StorPort
System log
Information
Message and fields (as Event Viewer shows them) 
Performance summary for Storport Device (Port = …, Path = …, Target = …, Lun = …) whose Corresponding Class Disk Device Guid is …:                 
Total IO:…                 
For latency buckets of …,                 
The IO success counts are …, …, …, …, …, …, …, …, …, …, …, …, …, ….                 
The IO failed counts are …, …, …, …, …, …, …, …, …, …, …, …, …, ….                 
The IO total latency (in 100ns) are …, …, …, …, …, …, …, …, …, …, …, …, …, ….                 
Total Bytes Read:…                 
Total Bytes Written:…

Idle task ID … has returned from its explicit processing notification.

Event 505
TaskScheduler
TaskScheduler/Operational log
Information
Message and fields (as Event Viewer shows them) 
Idle task ID … has returned from its explicit processing notification.