diff --git a/Include/Aurora/Memory/ByteBuffer.hpp b/Include/Aurora/Memory/ByteBuffer.hpp
index 7c01a4f6..9f225059 100644
--- a/Include/Aurora/Memory/ByteBuffer.hpp
+++ b/Include/Aurora/Memory/ByteBuffer.hpp
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <Aurora/Locale/ECodePage.hpp>
+#include <Aurora/Utility/PrivData.hpp>
 
 namespace Aurora::Memory
 {
@@ -44,10 +45,16 @@ namespace Aurora::Memory
      */
     struct ByteBuffer
     {
+        ///////////////////////////////////////////////////////////////////////
+        // User storage:                                                     //
+        ///////////////////////////////////////////////////////////////////////
+        AURT_ADD_USR_DATA;
+        ///////////////////////////////////////////////////////////////////////
+
         ///////////////////////////////////////////////////////////////////////
         // Stable ByteBuffer ABI Header; length and read/write head pointers //
         ///////////////////////////////////////////////////////////////////////
-        
+
         /// Internal capacity to mitigate trivial reallocs
         AuUInt allocSize;
         
@@ -56,32 +63,38 @@ namespace Aurora::Memory
 
         /// Buffer pointer
         AuUInt8 *base {};
-        /// Stream pointer
+        /// Read stream pointer
         AuUInt8 *readPtr {};
-        /// Stream pointer
+        /// Write stream pointer
         AuUInt8 *writePtr {};
-        
-        ///////////////////////////////////////////////////////////////////////
-        //  Stable ByteBuffer ABI Header; u32 flags                          //
-        ///////////////////////////////////////////////////////////////////////
-        /// Is ring buffer?
-        AuUInt8 flagCircular   : 1 {};
 
-        /// Should resize linear buffer to accommodate additional writes
-        AuUInt8 flagExpandable : 1 {};
-        
-        AuUInt8 flagReadError  : 1 {};
-        AuUInt8 flagWriteError : 1 {};
-        AuUInt8 flagNoFree : 1 {};
-        AuUInt8 flagNoRealloc: 1 {};
-        AuUInt8 flagAlwaysExpandable : 1 {};
-        // TODO: flag: allow circular overrun to allow for 100% access of the buffer from either read head
-        // - implicit padding
-        AuUInt8 scaleSize {};// 
-        AuUInt8 alignment {};
+        ///////////////////////////////////////////////////////////////////////
+        // Memory protection
+        // (resize/free/etc fails when this value is not zero. free-during-use protection)
+        ///////////////////////////////////////////////////////////////////////
         AuAUInt32 uInUseCounter { 0 };
         ///////////////////////////////////////////////////////////////////////
         
+        ///////////////////////////////////////////////////////////////////////
+        //  Stable ByteBuffer ABI Header; u8 flags                           //
+        ///////////////////////////////////////////////////////////////////////
+        
+        AuUInt8 flagCircular   : 1 {};       /// Is ring buffer?
+        AuUInt8 flagExpandable : 1 {};       /// Should resize linear buffer to accommodate additional writes
+        AuUInt8 flagReadError  : 1 {};       /// Has error? Has read error?
+        AuUInt8 flagWriteError : 1 {};       /// Has error? Has write error?
+        AuUInt8 flagNoFree     : 1 {};       /// Prevents all free operations
+        AuUInt8 flagNoRealloc  : 1 {};       /// Prevents a subset of free options, specifically realloc, operations
+        AuUInt8 flagAlwaysExpandable : 1 {}; /// Internal flag. Do not use.
+        AuUInt8 flagReserveA   : 1 {};       /// Placeholder
+
+        ///////////////////////////////////////////////////////////////////////
+        // Special flags/values
+        ///////////////////////////////////////////////////////////////////////
+        AuUInt8 alignment {};  // Internal value: keeps track of explicit Allocate of alignment values
+        AuUInt8 scaleSize {};  // TODO:
+        ///////////////////////////////////////////////////////////////////////
+
         /**
          * @brief Move constructor
          * @param buffer 
diff --git a/Include/Aurora/Utility/PrivData.hpp b/Include/Aurora/Utility/PrivData.hpp
index b2a1c561..6cbcd055 100644
--- a/Include/Aurora/Utility/PrivData.hpp
+++ b/Include/Aurora/Utility/PrivData.hpp
@@ -94,7 +94,8 @@ namespace Aurora::Utility
         inline void PrivateUserDataClear()\
         {\
             AuResetMember(this->_auReservedUserData.pData);\
-        }
+        }\
+    public:
 
 #define AURT_ADD_USR_DATA_EXP(exp)  \
         inline virtual AURT_PRIVATE_DATA_PTR PrivateUserDataGet()\