diff --git a/Delta.xcodeproj/project.pbxproj b/Delta.xcodeproj/project.pbxproj
index d87910a..5bbdf2d 100644
--- a/Delta.xcodeproj/project.pbxproj
+++ b/Delta.xcodeproj/project.pbxproj
@@ -152,6 +152,7 @@
 		BFFA4C091E8A24D600D87934 /* GameTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFA4C081E8A24D600D87934 /* GameTableViewCell.swift */; };
 		BFFA71DD1AAC406100EE9DD1 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFA71DC1AAC406100EE9DD1 /* AppDelegate.swift */; };
 		BFFA71E21AAC406100EE9DD1 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = BFFA71E01AAC406100EE9DD1 /* Main.storyboard */; };
+		BFFBD3D9224A0756002EFC79 /* URL+ExtendedAttributes.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFBD3D8224A0756002EFC79 /* URL+ExtendedAttributes.swift */; };
 		BFFC461E1D59823500AF2CC6 /* GamesPresentationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFC461B1D59823500AF2CC6 /* GamesPresentationController.swift */; };
 		BFFC461F1D59823500AF2CC6 /* GamesStoryboardSegue.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFC461C1D59823500AF2CC6 /* GamesStoryboardSegue.swift */; };
 		BFFC46201D59823500AF2CC6 /* InitialGamesStoryboardSegue.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFFC461D1D59823500AF2CC6 /* InitialGamesStoryboardSegue.swift */; };
@@ -319,6 +320,7 @@
 		BFFA71DB1AAC406100EE9DD1 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		BFFA71DC1AAC406100EE9DD1 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		BFFA71E11AAC406100EE9DD1 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		BFFBD3D8224A0756002EFC79 /* URL+ExtendedAttributes.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "URL+ExtendedAttributes.swift"; sourceTree = "<group>"; };
 		BFFC461B1D59823500AF2CC6 /* GamesPresentationController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GamesPresentationController.swift; sourceTree = "<group>"; };
 		BFFC461C1D59823500AF2CC6 /* GamesStoryboardSegue.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GamesStoryboardSegue.swift; sourceTree = "<group>"; };
 		BFFC461D1D59823500AF2CC6 /* InitialGamesStoryboardSegue.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = InitialGamesStoryboardSegue.swift; sourceTree = "<group>"; };
@@ -370,6 +372,7 @@
 				BF6424841F5CBDC900D6AB44 /* UIView+ParentViewController.swift */,
 				BFC3627F21ADE2BA00EF2BE6 /* UIAlertController+Error.swift */,
 				BF1F45AC21AF57BA00EF9895 /* HarmonyMetadataKey+Keys.swift */,
+				BFFBD3D8224A0756002EFC79 /* URL+ExtendedAttributes.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -1073,6 +1076,7 @@
 				BF4828861F9028F500028B97 /* System.swift in Sources */,
 				BF13A7561D5D29B0000BB055 /* PreviewGameViewController.swift in Sources */,
 				BF6866171DCAC8B900BF2D06 /* ControllerSkin+Configuring.swift in Sources */,
+				BFFBD3D9224A0756002EFC79 /* URL+ExtendedAttributes.swift in Sources */,
 				BF713C0822499ED4004A1A2B /* PreviousHarmony.xcdatamodeld in Sources */,
 				BF59427D1E09BC830051894B /* ControllerSkin.swift in Sources */,
 				BFAB9F7D219A43380080EC7D /* SyncManager.swift in Sources */,
diff --git a/Delta/Emulation/GameViewController.swift b/Delta/Emulation/GameViewController.swift
index 548bfa0..18c3aba 100644
--- a/Delta/Emulation/GameViewController.swift
+++ b/Delta/Emulation/GameViewController.swift
@@ -527,22 +527,32 @@ private extension GameViewController
         guard let game = self.game as? Game else { return }
         
         DatabaseManager.shared.performBackgroundTask { (context) in
-            let game = context.object(with: game.objectID) as! Game
-            
-            if let gameSave = game.gameSave
-            {
-                gameSave.modifiedDate = Date()
-            }
-            else
-            {
-                let gameSave = GameSave(context: context)
-                gameSave.identifier = game.identifier
-                game.gameSave = gameSave
-            }
-            
             do
             {
+                let game = context.object(with: game.objectID) as! Game
+                
+                let hash = try RSTHasher.sha1HashOfFile(at: game.gameSaveURL)
+                let previousHash = game.gameSaveURL.extendedAttribute(name: "com.rileytestut.delta.sha1Hash")
+                
+                guard hash != previousHash else { return }
+                
+                if let gameSave = game.gameSave
+                {
+                    gameSave.modifiedDate = Date()
+                }
+                else
+                {
+                    let gameSave = GameSave(context: context)
+                    gameSave.identifier = game.identifier
+                    game.gameSave = gameSave
+                }
+                
                 try context.save()
+                try game.gameSaveURL.setExtendedAttribute(name: "com.rileytestut.delta.sha1Hash", value: hash)
+            }
+            catch CocoaError.fileNoSuchFile
+            {
+                // Ignore
             }
             catch
             {
diff --git a/Delta/Extensions/URL+ExtendedAttributes.swift b/Delta/Extensions/URL+ExtendedAttributes.swift
new file mode 100644
index 0000000..596ef1c
--- /dev/null
+++ b/Delta/Extensions/URL+ExtendedAttributes.swift
@@ -0,0 +1,45 @@
+//
+//  URL+ExtendedAttributes.swift
+//  Delta
+//
+//  Created by Riley Testut on 3/26/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+extension URL
+{
+    func setExtendedAttribute(name: String, value: String) throws
+    {
+        try self.withUnsafeFileSystemRepresentation { (path) in
+            let data = value.data(using: .utf8)
+            let result = data?.withUnsafeBytes { (buffer) in
+                setxattr(path, name, buffer.baseAddress, buffer.count, 0, 0)
+            }
+            
+            if let result = result, result < 0
+            {
+                throw POSIXError(POSIXErrorCode(rawValue: errno) ?? .ENOENT)
+            }
+        }
+    }
+    
+    func extendedAttribute(name: String) -> String?
+    {
+        let value = self.withUnsafeFileSystemRepresentation { (path) -> String? in
+            let size = getxattr(path, name, nil, 0, 0, 0)
+            guard size >= 0 else { return nil }
+            
+            var data = Data(count: size)
+            let result = data.withUnsafeMutableBytes { getxattr(path, name, $0.baseAddress, $0.count, 0, 0) }
+            
+            guard result >= 0 else { return nil }
+            
+            let value = String(data: data, encoding: .utf8)!
+            return value
+        }
+        
+        return value
+    }
+}