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For those of us with more than one hard drive, and with power management options enabled for disks, you might find yourself in the same situation as I've been in - asking the question 'Is that drive really powered down?'. I coded up the below example to get that information to you. Note that it reads power states for ALL drives, and the status information for removable & virtual drives will either show up as 'Unknown' or Powered-On. As a courtesy, please be sure to credit me or keep the UDF header intact if you use the code ; =============================================================================================================================== ; <DrivesPowerStatus.au3> ; ; Reports the Power status for all drives. ; ; Functions: ; _DriveGetPowerState() ; Returns a boolean indicating drive status (True=active, False=low power or powered-off) ; ; Author: Ascend4nt ; =============================================================================================================================== #include <Array.au3> Local $aDrives,$aDevInfo $aDrives=DriveGetDrive("ALL") ; returns array of 'drive:' with lower-case letters If @error Then Exit ; Create 2D array - 2nd column will carry the Power State info, 3rd Drive Type Dim $aDriveStates[$aDrives[0]+1][3] ; Copy over drives and get Power States For $i=1 To $aDrives[0] $aDriveStates[$i][0]=StringUpper($aDrives[$i]) $aDriveStates[$i][1]=_DriveGetPowerState($aDrives[$i]) If @error Then $aDriveStates[$i][1]="Unknown" $aDriveStates[$i][2]=DriveGetType($aDrives[$i]) Next $aDriveStates[0][0]="Drive" $aDriveStates[0][1]="Active Power State?" $aDriveStates[0][2]="Drive Type" _ArrayDisplay($aDriveStates,"Drives Power Status") ; =================================================================================================================== ; Func _DriveGetPowerState($sDrive) ; ; Returns a boolean representing the active power state of the given drive. ; True = Active (powered on, active), False = Inactive (either powered off, or in a low power state) ; ; $sDrive = Drive letter, or full path (only the Drive letter is extracted from the string) ; ; Returns: ; Success: True/False ; Failure: -1, with @error set: ; @error = 1 = invalid parameter ; @error = 2 = DLLCall error. @extended contains DLLCall error code (see AutoIt Help) ; @error = 3 = API call error. Call 'GetLastError' for more info ; ; Author: Ascend4nt ; =================================================================================================================== Func _DriveGetPowerState($sDrive) $sDrive=StringLeft($sDrive,1) If StringIsAlpha($sDrive)=0 Then Return SetError(1,0,-1) ; Device path for logical drives: '\\.\C:' Local $iErr,$aRet,$hDisk,$sDevicePath='\\.\'&$sDrive&':' #cs ; API call params: [0 Access (for metadata & device info),3 ShareMode for 'Read'+'Write', ; 0 (NULL) SecurityAttribs (i.e. none),3 CreationDisposition for 'OpenExisting',0 Flags,0 (NULL) TemplateFile] ; *We could also use _WinAPI_CreateFile($sDevicePath,2,8,6), but there's no guarantee that '8' as the 3rd param ; will continue to work (its currently a sort of 'hack' to work around the limitations of the UDF [to force AccessMode to 0]) #ce $aRet=DllCall('kernel32.dll','handle','CreateFileW','wstr',$sDevicePath,'dword',0,'dword',3,'ptr',0,'dword',3,'dword',0,'ptr',0) If @error Then Return SetError(2,@error,-1) If $aRet[0]=-1 Then Return SetError(3,0,-1) $hDisk=$aRet[0] ;~ ConsoleWrite("Handle for Drive '"&$sDrive&":' = "&$hDisk&@CRLF) $aRet=DllCall('kernel32.dll','bool','GetDevicePowerState','handle',$hDisk,'bool*',0) $iErr=@error ; We don't worry about whether this is successful, since there's nothing we can do about it: DllCall('kernel32.dll','bool','CloseHandle','handle',$hDisk) ; Error with GetDevicePowerState call? If $iErr Then Return SetError(2,$iErr,-1) If Not $aRet[0] Then Return SetError(3,0,-1) ;~ ConsoleWrite("$aRet[2]="&$aRet[2]&@CRLF) Return ($aRet[2]<>0) EndFunc