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I installed DrivePool 64bit on 4/4/2015, since then my application log is just filled with 'Volume Shadow Copy Service error: Unexpected error DeviceIoControl'. Today alone there are easily more than 100 log entries for this. Why am I getting so many Volume Shadow Copy Service errors? This is the last one I received: Log Name: Application Source: VSS Date: 4/21/2015 2:12:59 PM Event ID: 12294 Task Category: None Level: Error Keywords: Classic User: N/A Computer: Built-7 Description: Volume Shadow Copy Service error: Error calling a routine on the Shadow Copy Provider {b5946137-7b9f-4925-af80-51abd60b20d5}. Routine returned E_INVALIDARG. Routine details GetSnapshot({00000000-0000-0000-0000-000000000000},00000000003347E0). Operation: Get Shadow Copy Properties Context: Execution Context: Coordinator Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="VSS" /> <EventID Qualifiers="0">12294</EventID> <Level>2</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2015-04-21T20:12:59.000000000Z" /> <EventRecordID>66285</EventRecordID> <Channel>Application</Channel> <Computer>Built-7</Computer> <Security /> </System> <EventData> <Data>{b5946137-7b9f-4925-af80-51abd60b20d5}</Data> <Data>GetSnapshot({00000000-0000-0000-0000-000000000000},00000000003347E0)</Data> <Data> Operation: Get Shadow Copy Properties Context: Execution Context: Coordinator</Data> <Binary>2D20436F64653A20434F52434F4F524330303030303835302D2043616C6C3A20434F52434F4F524330303030303739372D205049443A202030303733323836382D205449443A202030303733303536342D20434D443A2020433A5C57696E646F77735C73797374656D33325C76737376632E6578652020202D20557365723A204E616D653A204E5420415554484F524954595C53595354454D2C205349443A532D312D352D313820</Binary> </EventData> </Event> I also see this in the system log, over and over again: Log Name: System Source: volsnap Date: 4/21/2015 12:35:50 AM Event ID: 2 Task Category: None Level: Error Keywords: Classic User: N/A Computer: Built-7 Description: The shadow copy of volume O: could not be created because volume O:, which is specified as the location for shadow copy storage, is not an NTFS volume or an error was encountered while trying to determine the file system type of this volume. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="volsnap" /> <EventID Qualifiers="49158">2</EventID> <Level>2</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2015-04-21T06:35:50.619942500Z" /> <EventRecordID>1102466</EventRecordID> <Channel>System</Channel> <Computer>Built-7</Computer> <Security /> </System> <EventData> <Data>\Device\HarddiskVolumeShadowCopy882</Data> <Data>O:</Data> <Data>O:</Data> <Binary>000000000300300000000000020006C0000000000000000053000000000000000000000000000000</Binary> </EventData> </Event> O: drive is my drivepool drive that the application created.