diff --git a/hdr/dsk.h b/hdr/dsk.h
index 1f93a4e..96cd257 100644
--- a/hdr/dsk.h
+++ b/hdr/dsk.h
@@ -3,10 +3,8 @@
 /*                           dsk.h                              */
 /*                      Disk access Header File                 */
 /*                                                              */
-/*                       November 20, 1991                      */
-/*                                                              */
-/*                      Copyright (c) 1995                      */
-/*                      Pasquale J. Villani                     */
+/*                      Copyright (c) 2012                      */
+/*                      FreeDOS                                 */
 /*                      All Rights Reserved                     */
 /*                                                              */
 /* This file is part of DOS-C.                                  */
@@ -29,5 +27,5 @@
 
 
 #ifndef MAX_SEC_SIZE
-#define MAX_SEC_SIZE    (4*512) /* max supported size of sector in bytes */
+#define MAX_SEC_SIZE    (1*512) /* max supported size of sector in bytes */
 #endif
diff --git a/kernel/kernel.asm b/kernel/kernel.asm
index fc6846c..de80b31 100644
--- a/kernel/kernel.asm
+++ b/kernel/kernel.asm
@@ -302,7 +302,7 @@ _clock          dd      0               ; 0008 CLOCK$ device
                 global  _syscon
 _syscon         dw      _con_dev,seg _con_dev   ; 000c console device
                 global  _maxsecsize
-_maxsecsize     dw      4096            ; 0010 maximum bytes/sector of any block device
+_maxsecsize     dw      512             ; 0010 maximum bytes/sector of any block device
                 dd      0               ; 0012 pointer to buffers info structure
                 global  _CDSp
 _CDSp           dd      0               ; 0016 Current Directory Structure