Event Id 12 is logged in the system log when you backup a hard disk on a Windows Server 2008 machine. Backup job runs, and the following error message is being shown in the system log of the event viewer:
System Log entry:
Log Name: System
Event ID: 12
Task Category: None
Computer: computer name
The device 'MSFT Virtual HD SCSI Disk Device' (SCSI\Disk&Ven_MSFT&Prod_Virtual_HD\GUID) disappeared from the system without first being prepared for removal.
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