From bfa03497ad0981a5f66899c330bfeafcb27d043b Mon Sep 17 00:00:00 2001
From: Brian Palmer <brianp@sginet.com>
Date: Fri, 8 Feb 2002 23:58:12 +0000
Subject: [PATCH] CacheInitializeDrive() no longer retains old cache data on
 removable drives Fixed small bug where it could possibly try to read more
 sectors than the BIOS supports

svn path=/trunk/; revision=2611
---
 freeldr/freeldr/cache/cache.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/freeldr/freeldr/cache/cache.c b/freeldr/freeldr/cache/cache.c
index 70fc10ab7d2..c739421bd30 100644
--- a/freeldr/freeldr/cache/cache.c
+++ b/freeldr/freeldr/cache/cache.c
@@ -41,8 +41,11 @@ BOOL CacheInitializeDrive(ULONG DriveNumber)
 	PCACHE_BLOCK	NextCacheBlock;
 
 	// If we already have a cache for this drive then
-	// by all means lets keep it
-	if (CacheManagerInitialized && DriveNumber == CacheManagerDrive.DriveNumber)
+	// by all means lets keep it, unless it is a removable
+	// drive, in which case we'll invalidate the cache
+	if ((CacheManagerInitialized == TRUE) &&
+		(DriveNumber == CacheManagerDrive.DriveNumber) &&
+		(DriveNumber >= 0x80))
 	{
 		return TRUE;
 	}
@@ -85,7 +88,10 @@ BOOL CacheInitializeDrive(ULONG DriveNumber)
 	// If not then the block size is the size of one track
 	if (CacheManagerDrive.LbaSupported)
 	{
-		CacheManagerDrive.BlockSize = 128;
+		// FIXME: Temporarily reduced this to
+		// 64 sectors since not all BIOS calls
+		// support reading as many as 128 sectors
+		CacheManagerDrive.BlockSize = 64;//128;
 	}
 	else
 	{