From f8b87477ce8c372db4b5e8ae630a5e642ed31b1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
Date: Sun, 29 Jul 2012 15:45:57 +0000
Subject: [PATCH] freeldr: seek to correct sector number, even after ~4GB. See
 issue #6669 for more details.

svn path=/trunk/; revision=56981
---
 reactos/boot/freeldr/freeldr/fs/fat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/reactos/boot/freeldr/freeldr/fs/fat.c b/reactos/boot/freeldr/freeldr/fs/fat.c
index 49fe95af8cf..ce37e9eb029 100644
--- a/reactos/boot/freeldr/freeldr/fs/fat.c
+++ b/reactos/boot/freeldr/freeldr/fs/fat.c
@@ -1338,7 +1338,8 @@ BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG
 	//
 	// Seek to right position
 	//
-	Position.QuadPart = SectorNumber * 512;
+	Position.HighPart = SectorNumber >> 9;
+	Position.LowPart = SectorNumber << 9;
 	ret = ArcSeek(Volume->DeviceId, &Position, SeekAbsolute);
 	if (ret != ESUCCESS)
 	{