diff --git a/reactos/drivers/storage/disk/disk.c b/reactos/drivers/storage/disk/disk.c
index a461d02b63e..bf706743e3d 100644
--- a/reactos/drivers/storage/disk/disk.c
+++ b/reactos/drivers/storage/disk/disk.c
@@ -1129,10 +1129,10 @@ DiskClassDeviceControl(IN PDEVICE_OBJECT DeviceObject,
 	  {
 	    Status = STATUS_INFO_LENGTH_MISMATCH;
 	  }
-	else if (DiskData->PartitionNumber == 0)
-	  {
-	    Status = STATUS_INVALID_DEVICE_REQUEST;
-	  }
+	//else if (DiskData->PartitionNumber == 0)
+//	  {
+//	    Status = STATUS_INVALID_DEVICE_REQUEST;
+	  //}
 	else
 	{
 	    PPARTITION_INFORMATION PartitionInfo;
diff --git a/reactos/ntoskrnl/io/iomgr/arcname.c b/reactos/ntoskrnl/io/iomgr/arcname.c
index de400612302..4dded3505aa 100644
--- a/reactos/ntoskrnl/io/iomgr/arcname.c
+++ b/reactos/ntoskrnl/io/iomgr/arcname.c
@@ -134,7 +134,7 @@ IopGetDiskInformation(IN ULONG i,
     PIRP Irp;
     IO_STATUS_BLOCK StatusBlock;
     LARGE_INTEGER PartitionOffset;
-    PPARTITION_SECTOR PartitionBuffer;
+    PULONG PartitionBuffer;
 
     /* Build the name */
     sprintf(Buffer, "\\Device\\Harddisk%lu\\Partition0", i);
@@ -241,10 +241,7 @@ IopGetDiskInformation(IN ULONG i,
 
     /* Calculate the MBR checksum */
     Checksum = 0;
-    for (j = 0; j < 128; j++)
-    {
-        Checksum += ((PULONG)PartitionBuffer)[j];
-    }
+    for (j = 0; j < 128; j++) Checksum += PartitionBuffer[j];
 
     /* Save the signature and checksum */
     *CheckSum = ~Checksum + 1;
diff --git a/reactos/ntoskrnl/ke/i386/clock.S b/reactos/ntoskrnl/ke/i386/clock.S
index c7d26432432..aacdc7a002e 100644
--- a/reactos/ntoskrnl/ke/i386/clock.S
+++ b/reactos/ntoskrnl/ke/i386/clock.S
@@ -207,12 +207,12 @@ _KeUpdateSystemTime@0:
     mov [_KeTickCount+4], edx
 
     /* Store in in shared data too */
-    mov [USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT+8], edx
-    mov [USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT], ecx
-    mov [USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT+4], edx
+    mov ds:[USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT+8], edx
+    mov ds:[USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT], ecx
+    mov ds:[USER_SHARED_DATA+USER_SHARED_DATA_TICK_COUNT+4], edx
 
     /* FIXME: HACK */
-    mov [USER_SHARED_DATA], ecx
+    mov ds:[USER_SHARED_DATA], ecx
 
 IncompleteTick: