Index: pool.c
===================================================================
--- ntoskrnl/mm/ARM3/pool.c	(revision 71358)
+++ ntoskrnl/mm/ARM3/pool.c	(working copy)
@@ -24,7 +24,7 @@
 KGUARDED_MUTEX MmPagedPoolMutex;
 MM_PAGED_POOL_INFO MmPagedPoolInfo;
 SIZE_T MmAllocatedNonPagedPool;
-ULONG MmSpecialPoolTag;
+ULONG MmSpecialPoolTag = 1;
 ULONG MmConsumedPoolPercentage;
 BOOLEAN MmProtectFreedNonPagedPool;
 SLIST_HEADER MiNonPagedPoolSListHead;
Index: special.c
===================================================================
--- ntoskrnl/mm/ARM3/special.c	(revision 71358)
+++ ntoskrnl/mm/ARM3/special.c	(working copy)
@@ -80,7 +80,7 @@
     if (NumberOfBytes > (PAGE_SIZE - sizeof(POOL_HEADER)))
         return FALSE;
 
-    return Tag == MmSpecialPoolTag;
+    return TRUE;
 }
 
 BOOLEAN
Index: id_ata.cpp
===================================================================
--- drivers/storage/ide/uniata/id_ata.cpp	(revision 71358)
+++ drivers/storage/ide/uniata/id_ata.cpp	(working copy)
@@ -5924,6 +5924,17 @@
                     if (srb->Cdb[0] == SCSIOP_READ_CAPACITY) {
 
                         AtaReq->DataBuffer -= wordCount;
+                        if (!MmIsAddressValid(AtaReq->DataBuffer) ||
+                            (PCHAR)AtaReq->DataBuffer < (PCHAR)srb->DataBuffer ||
+                            (PCHAR)AtaReq->DataBuffer > (PCHAR)srb->DataBuffer + srb->DataTransferLength - 3 * sizeof(USHORT))
+                        {
+                            DbgPrint("Accessing DataBuffer for req %p at %p. Valid: %u\n",
+                                     AtaReq, AtaReq->DataBuffer, MmIsAddressValid(AtaReq->DataBuffer));
+                            DbgPrint("WordsLeft: %lu, WordsTransfered: %lu, wordCount: %lu\n",
+                                     AtaReq->WordsLeft, AtaReq->WordsTransfered, wordCount);
+                            DbgPrint("SRB %p DataBuffer %p DataTransferLength %p\n",
+                                     srb, srb->DataBuffer, srb->DataTransferLength);
+                        }
                         if (AtaReq->DataBuffer[0] == 0x00) {
                             *((ULONG *) &(AtaReq->DataBuffer[0])) = 0xFFFFFF7F;
                         }