diff -up dvd+rw-tools-7.1/growisofs_mmc.cpp.lastshort dvd+rw-tools-7.1/growisofs_mmc.cpp
--- dvd+rw-tools-7.1/growisofs_mmc.cpp.lastshort	2012-04-13 18:09:31.047641524 +0200
+++ dvd+rw-tools-7.1/growisofs_mmc.cpp	2012-04-13 18:09:34.451763587 +0200
@@ -540,7 +540,7 @@ ssize_t poor_mans_pwrite64 (int fd,const
 	// own higher HZ value and disrespects the user-land one.
 	// Sending them down as milliseconds is just safer...
 	//
-	if (!(errcode=cmd.transport (WRITE,(void *)buff,size)))
+	if (!(errcode=cmd.transport (WRITE,(void *)buff,nbl*2048)))
 	    break;
 
 	//--- WRITE failed ---//