diff --git a/src/dos/dos_mscdex.cpp b/src/dos/dos_mscdex.cpp
index 3753337a..cab04d47 100644
--- a/src/dos/dos_mscdex.cpp
+++ b/src/dos/dos_mscdex.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: dos_mscdex.cpp,v 1.45 2007-01-21 16:21:22 c2woody Exp $ */
+/* $Id: dos_mscdex.cpp,v 1.46 2007-04-15 11:39:33 c2woody Exp $ */
 
 #include <string.h>
 #include <ctype.h>
@@ -876,7 +876,10 @@ static Bit16u MSCDEX_IOCTL_Input(PhysPt buffer,Bit8u drive_unit) {
 					mscdex->GetCurrentPos(drive_unit,pos);
 					Bit8u addr_mode = mem_readb(buffer+1);
 					if (addr_mode==0) {			// HSG
-						mem_writed(buffer+2,MSF_TO_FRAMES (pos.min, pos.sec, pos.fr));
+						Bit32u frames=MSF_TO_FRAMES(pos.min, pos.sec, pos.fr);
+						if (frames<150) LOG_MSG("MSCDEX: Get position: invalid position %d:%d:%d", pos.min, pos.sec, pos.fr);
+						else frames-=150;
+						mem_writed(buffer+2,frames);
 					} else if (addr_mode==1) {	// Red book
 						mem_writeb(buffer+2,pos.fr);
 						mem_writeb(buffer+3,pos.sec);