Index: Universal/Disk/PartitionDxe/Partition.c
===================================================================
--- Universal/Disk/PartitionDxe/Partition.c	(revision 17084)
+++ Universal/Disk/PartitionDxe/Partition.c	(working copy)
@@ -4,7 +4,7 @@
   of the raw block devices media. Currently "El Torito CD-ROM", Legacy
   MBR, and GPT partition schemes are supported.
 
-Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -578,9 +578,9 @@
   EFI_STATUS                 Status;
 
   //
-  // Read 1 byte from offset 0 but passing NULL as buffer pointer
+  // Read 0 byte from offset 0 and passing NULL as buffer pointer
   //
-  Status = DiskIo->ReadDisk (DiskIo, MediaId, 0, 1, NULL);
+  Status = DiskIo->ReadDisk (DiskIo, MediaId, 0, 0, NULL);
   if ((Status == EFI_NO_MEDIA) || (Status == EFI_MEDIA_CHANGED)) {
     return Status;
   }