Index: /trunk/src/VBox/Devices/Storage/DrvHostBase.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DrvHostBase.cpp	(revision 37600)
+++ /trunk/src/VBox/Devices/Storage/DrvHostBase.cpp	(revision 37601)
@@ -1158,5 +1158,5 @@
     IO_STATUS_BLOCK             IoStatusBlock = {0};
     FILE_FS_SIZE_INFORMATION    FsSize= {0};
-    NTSTATUS rcNt = NtQueryVolumeInformationFile(RTFileToNative(pThis->hFileDevice),  &IoStatusBlock,
+    NTSTATUS rcNt = NtQueryVolumeInformationFile((HANDLE)RTFileToNative(pThis->hFileDevice),  &IoStatusBlock,
                                                  &FsSize, sizeof(FsSize), FileFsSizeInformation);
     int cRetries = 5;
@@ -1164,5 +1164,5 @@
     {
         RTThreadSleep(10);
-        rcNt = NtQueryVolumeInformationFile(RTFileToNative(pThis->hFileDevice),  &IoStatusBlock,
+        rcNt = NtQueryVolumeInformationFile((HANDLE)RTFileToNative(pThis->hFileDevice),  &IoStatusBlock,
                                             &FsSize, sizeof(FsSize), FileFsSizeInformation);
     }
Index: /trunk/src/VBox/Devices/Storage/DrvHostDVD.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DrvHostDVD.cpp	(revision 37600)
+++ /trunk/src/VBox/Devices/Storage/DrvHostDVD.cpp	(revision 37601)
@@ -189,5 +189,5 @@
                 /* do ioctl */
                 DWORD cbReturned;
-                if (DeviceIoControl(RTFileToNative(hFileDevice), IOCTL_STORAGE_EJECT_MEDIA,
+                if (DeviceIoControl((HANDLE)RTFileToNative(hFileDevice), IOCTL_STORAGE_EJECT_MEDIA,
                                     NULL, 0,
                                     NULL, 0, &cbReturned,
@@ -274,5 +274,5 @@
     DWORD cbReturned;
     int rc;
-    if (DeviceIoControl(RTFileToNative(pThis->hFileDevice), IOCTL_STORAGE_MEDIA_REMOVAL,
+    if (DeviceIoControl((HANDLE)RTFileToNative(pThis->hFileDevice), IOCTL_STORAGE_MEDIA_REMOVAL,
                         &PreventMediaRemoval, sizeof(PreventMediaRemoval),
                         NULL, 0, &cbReturned,
@@ -620,5 +620,5 @@
     Req.spt.SenseInfoLength = (UCHAR)RT_MIN(sizeof(Req.aSense), cbSense);
     Req.spt.SenseInfoOffset = RT_OFFSETOF(struct _REQ, aSense);
-    if (DeviceIoControl(RTFileToNative(pThis->hFileDevice), IOCTL_SCSI_PASS_THROUGH_DIRECT,
+    if (DeviceIoControl((HANDLE)RTFileToNative(pThis->hFileDevice), IOCTL_SCSI_PASS_THROUGH_DIRECT,
                         &Req, sizeof(Req), &Req, sizeof(Req), &cbReturned, NULL))
     {