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Asked: 2026-05-10T16:27:33+00:00

Is it possible to get notified (without polling, but via an event) when a

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Is it possible to get notified (without polling, but via an event) when a drive letter becomes accessible. For example if you have an external hard drive that always appears as drive F – is it possible to have an event raised when that is connected and F becomes accessible?

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  1. Okay.. found what I was looking for 🙂

    Take a look at this VBScript: (source):

    strComputer = '.' Set objWMIService = GetObject('winmgmts:\\' & strComputer & '\root\cimv2')  Set colEvents = objWMIService.ExecNotificationQuery _     ('Select * From __InstanceOperationEvent Within 10 Where ' _         & 'TargetInstance isa 'Win32_LogicalDisk'')  Do While True     Set objEvent = colEvents.NextEvent     If objEvent.TargetInstance.DriveType = 2 Then          Select Case objEvent.Path_.Class             Case '__InstanceCreationEvent'                 Wscript.Echo 'Drive ' & objEvent.TargetInstance.DeviceId & _                     ' has been added.'             Case '__InstanceDeletionEvent'                 Wscript.Echo 'Drive ' & objEvent.TargetInstance.DeviceId & _                     ' has been removed.'         End Select     End If Loop

    I leave it to your exercise to port it to C#.

    Instead of polling all the time you can use a WMI event sink.

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