diff --git a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
index 25f0b0aead..6d5af3b224 100644
--- a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
+++ b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
@@ -164,7 +164,7 @@ namespace BizHawk.Client.EmuHawk
 		public void Restart()
 		{
 			_rom = GetRomBytes();
-			_romDomain = MemoryDomain.FromByteArray("File on Disk", MemoryDomain.Endian.Little, _rom);
+			_romDomain = new MemoryDomainByteArray("File on Disk", MemoryDomain.Endian.Little, _rom, true, 1);
 
 			if (_domain.Name == _romDomain.Name)
 			{
diff --git a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs
index 3db494bc03..b5ddc5d8db 100644
--- a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
+++ b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
@@ -1,6 +1,4 @@
-using System;
-
-namespace BizHawk.Emulation.Common
+namespace BizHawk.Emulation.Common
 {
 	/// <summary>
 	/// A memory region and the functionality to read/write from it
@@ -25,16 +23,6 @@ namespace BizHawk.Emulation.Common
 
 		public abstract void PokeByte(long addr, byte val);
 
-		/// <summary>
-		/// creates a memorydomain that references a managed byte array
-		/// </summary>
-		/// <param name="writable">if false, writes will be ignored</param>
-		[Obsolete]
-		public static MemoryDomain FromByteArray(string name, Endian endian, byte[] data, bool writable = true, int wordSize = 1)
-		{
-			return new MemoryDomainByteArray(name, endian, data, writable, wordSize);
-		}
-
 		public override string ToString()
 		{
 			return Name;
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
index a5a543bf25..d8411ade8b 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
@@ -49,7 +49,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 
 		public MemoryDomain GetExRAM()
 		{
-			return MemoryDomain.FromByteArray("ExRAM", MemoryDomain.Endian.Little, EXRAM);
+			return new MemoryDomainByteArray("ExRAM", MemoryDomain.Endian.Little, EXRAM, true, 1);
 		}
 
 		/// <summary>