; Crazy Scripting : Safely Remove USB Flash Drive - 45L by SKAN
; http://www.autohotkey.com/forum/viewtopic.php?p=272661#272661

USBD_SafelyRemove( Drv ) {
 If A_OSVersion not in  WIN_VISTA,WIN_XP,WIN_2000
   Return
 If ! ( Serial := USBD_GetDeviceSerial( Drv ) )
   Return 
 DeviceID := USBD_GetDeviceID( Serial )
 USBD_DeviceEject( DeviceID )
 IfExist, %Drv%\, TrayTip, %DeviceID%, Drive %Drv% was not Ejected!, 10, 3
 Else, TrayTip, %DeviceID%, Drive %Drv% was safely Removed, 10, 1

}

USBD_GetDeviceSerial( Drv="" ) {
 DriveGet, DriveType, Type, %Drv%
  IfNotEqual,DriveType,Removable, Return
 RegRead, Hex, HKLM, SYSTEM\MountedDevices, \DosDevices\%Drv%
  VarSetCapacity(U,(Sz:=StrLen(Hex)//2)),  VarSetCapacity(A,Sz+1)
 Loop % Sz
  NumPut( "0x" . SubStr(hex,2*A_Index-1,2), U, A_Index-1, "Char" )
 DllCall( "WideCharToMultiByte", Int,0,Int,0, UInt,&U,UInt,Sz, Str,A,UInt,Sz, Int,0,Int,0)
 StringSplit, Part, A, #
  ParentIdPrefixCheck := SubStr( Part3,1,InStr(Part3,"&",0,0)-1 )
 IfEqual,A_OSVersion,WIN_VISTA, Return,ParentIdPrefixCheck
 Loop, HKLM, SYSTEM\CurrentControlSet\Enum\USBSTOR,1,0
   { Device := A_LoopRegName
    Loop, HKLM, SYSTEM\CurrentControlSet\Enum\USBSTOR\%Device%,1,0
      { Serial := A_LoopRegName
       RegRead, PIPrefix, HKLM, SYSTEM\CurrentControlSet\Enum\USBSTOR\%Device%\%Serial%
               , ParentIdPrefix
       If ( PIPrefix = ParentIdPrefixCheck )
         Return, SubStr( Serial,1,InStr(Serial,"&",0,0)-1 )
     }
}}

USBD_GetDeviceID( Serial ) {
 Loop, HKLM, SYSTEM\CurrentControlSet\Enum\USB\,1,0
   { Device := A_LoopRegName
    Loop, HKLM, SYSTEM\CurrentControlSet\Enum\USB\%Device%,1,0
     If ( A_LoopRegName=Serial )
      Return DllCall( "CharUpperA", Str, "USB\" Device "\" Serial, Str )
}}

USBD_DeviceEject( DeviceID ) {
 hMod := DllCall( "LoadLibrary", Str,"SetupAPI.dll" ), VarSetCapacity(VE,255,0)
 If ! DllCall( "SetupAPI\CM_Locate_DevNodeA", UIntP,DI, Str,DeviceID, Int,0 )
 If ! DllCall( "SetupAPI\CM_Get_DevNode_Status", UIntP,STS, UIntP,PR, UInt,DI, Int,0)
 DllCall( "SetupAPI\CM_Request_Device_EjectA", UInt,DI, UIntP,VT, Str,VE, UInt,255, Int,0)
 DllCall( "FreeLibrary", UInt,hMod )
}