diff --git a/SabreTools.DatFiles/DatFile.cs b/SabreTools.DatFiles/DatFile.cs
index ea312d02..52ff123d 100644
--- a/SabreTools.DatFiles/DatFile.cs
+++ b/SabreTools.DatFiles/DatFile.cs
@@ -506,6 +506,16 @@ namespace SabreTools.DatFiles
             return Enum.GetValues(typeof(ItemType)) as ItemType[];
         }
 
+        /// <summary>
+        /// Determine if an item has all required fields to write out
+        /// </summary>
+        /// <param name="datItem">DatItem to check</param>
+        /// <returns>True if the item has all required fields, false otherwise</returns>
+        /// <remarks>
+        /// TODO: Implement this in all relevant DatFile types
+        /// </remarks>
+        protected virtual bool HasRequiredFields(DatItem datItem) => true;
+
         /// <summary>
         /// Get if a machine contains any writable items
         /// </summary>
@@ -564,16 +574,6 @@ namespace SabreTools.DatFiles
             return false;
         }
 
-        /// <summary>
-        /// Determine if an item has all required fields to write out
-        /// </summary>
-        /// <param name="datItem">DatItem to check</param>
-        /// <returns>True if the item has all required fields, false otherwise</returns>
-        /// <remarks>
-        /// TODO: Implement this in all relevant DatFile types
-        /// </remarks>
-        protected virtual bool HasRequiredFields(DatItem datItem) => true;
-
         #endregion
     }
 }
diff --git a/SabreTools.DatFiles/Formats/Hashfile.cs b/SabreTools.DatFiles/Formats/Hashfile.cs
index 23e97075..2fbb9202 100644
--- a/SabreTools.DatFiles/Formats/Hashfile.cs
+++ b/SabreTools.DatFiles/Formats/Hashfile.cs
@@ -1,5 +1,7 @@
 using System;
+using System.ComponentModel;
 using System.IO;
+using System.Security.Cryptography;
 using System.Text;
 
 using SabreTools.Core;
@@ -107,6 +109,31 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Disk, ItemType.Media, ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override bool HasRequiredFields(DatItem datItem)
+        {
+            return true;
+
+            // TODO: Use this code once `strict` rules determined
+            return (_hash, datItem.ItemType) switch
+            {
+                (Hash.CRC, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.CRC),
+                (Hash.MD5, ItemType.Disk) => !string.IsNullOrEmpty((datItem as Disk)?.MD5),
+                (Hash.MD5, ItemType.Media) => !string.IsNullOrEmpty((datItem as Media)?.MD5),
+                (Hash.MD5, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.MD5),
+                (Hash.SHA1, ItemType.Disk) => !string.IsNullOrEmpty((datItem as Disk)?.SHA1),
+                (Hash.SHA1, ItemType.Media) => !string.IsNullOrEmpty((datItem as Media)?.SHA1),
+                (Hash.SHA1, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.SHA1),
+                (Hash.SHA256, ItemType.Media) => !string.IsNullOrEmpty((datItem as Media)?.SHA256),
+                (Hash.SHA256, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.SHA256),
+                (Hash.SHA384, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.SHA384),
+                (Hash.SHA512, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.SHA512),
+                (Hash.SpamSum, ItemType.Media) => !string.IsNullOrEmpty((datItem as Media)?.SpamSum),
+                (Hash.SpamSum, ItemType.Rom) => !string.IsNullOrEmpty((datItem as Rom)?.SpamSum),
+                _ => false,
+            };
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {