[ekohl] 51437: [CLASS2] Prepare ReactOS for the change from the ancient 32 sectors / 64 tracks disk layout (used until Windows NT4) to the modern 63 sectors / 255 tracks disk layout (used since Win...

Author: ekohl
Date: Sat Apr 23 10:52:01 2011
New Revision: 51437

URL: http://svn.reactos.org/svn/reactos?rev=51437&view=rev
Log:
[CLASS2]
Prepare ReactOS for the change from the ancient 32 sectors / 64 tracks disk layout (used
until Windows NT4) to the modern 63 sectors / 255 tracks disk layout (used since Windows
2000).

Modified:
    trunk/reactos/drivers/storage/class/class2/class2.c

Modified: trunk/reactos/drivers/storage/class/class2/class2.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/storage/class/clas…
==============================================================================
--- trunk/reactos/drivers/storage/class/class2/class2.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/storage/class/class2/class2.c [iso-8859-1] Sat Apr 23 10:52:01
2011
@@ -27,6 +27,14 @@
 
 #define INQUIRY_DATA_SIZE 2048
 #define START_UNIT_TIMEOUT  30
+
+/* Disk layout used by Windows NT4 and earlier versions. */
+#define DEFAULT_SECTORS_PER_TRACK    32
+#define DEFAULT_TRACKS_PER_CYLINDER  64
+
+/* Disk layout used by Windows 2000 and later versions. */
+//#define DEFAULT_SECTORS_PER_TRACK    63
+//#define DEFAULT_TRACKS_PER_CYLINDER 255
 
 NTSTATUS
 NTAPI
@@ -798,7 +806,7 @@
         // Calculate number of cylinders.
         //
 
-        deviceExtension->DiskGeometry->Geometry.Cylinders.QuadPart =
(LONGLONG)((lastSector + 1)/(32 * 64));
+        deviceExtension->DiskGeometry->Geometry.Cylinders.QuadPart =
(LONGLONG)((lastSector + 1)/(DEFAULT_SECTORS_PER_TRACK * DEFAULT_TRACKS_PER_CYLINDER));
 
         deviceExtension->PartitionLength.QuadPart =
             (deviceExtension->PartitionLength.QuadPart <<
deviceExtension->SectorShift);
@@ -821,16 +829,16 @@
         }
 
         //
-        // Assume sectors per track are 32;
-        //
-
-        deviceExtension->DiskGeometry->Geometry.SectorsPerTrack = 32;
-
-        //
-        // Assume tracks per cylinder (number of heads) is 64.
-        //
-
-        deviceExtension->DiskGeometry->Geometry.TracksPerCylinder = 64;
+        // Assume sectors per track are DEFAULT_SECTORS_PER_TRACK;
+        //
+
+        deviceExtension->DiskGeometry->Geometry.SectorsPerTrack =
DEFAULT_SECTORS_PER_TRACK;
+
+        //
+        // Assume tracks per cylinder (number of heads) is DEFAULT_TRACKS_PER_CYLINDER.
+        //
+
+        deviceExtension->DiskGeometry->Geometry.TracksPerCylinder =
DEFAULT_TRACKS_PER_CYLINDER;
     }
 
     if (status == STATUS_VERIFY_REQUIRED) {