diff --git a/SabreTools.Models/TAR/Archive.cs b/SabreTools.Models/TAR/Archive.cs
index 1f6665b..47a425e 100644
--- a/SabreTools.Models/TAR/Archive.cs
+++ b/SabreTools.Models/TAR/Archive.cs
@@ -1,10 +1,12 @@
+using System.Collections.Generic;
+
 namespace SabreTools.Models.TAR
 {
     public sealed class Archive
     {
         /// <summary>
-        /// File header
+        /// 1 or more entries
         /// </summary>
-        public Header? Header { get; set; }
+        public List<Entry>? Entries { get; set; }
     }
 }
\ No newline at end of file
diff --git a/SabreTools.Models/TAR/Block.cs b/SabreTools.Models/TAR/Block.cs
new file mode 100644
index 0000000..c3a3481
--- /dev/null
+++ b/SabreTools.Models/TAR/Block.cs
@@ -0,0 +1,7 @@
+namespace SabreTools.Models.TAR
+{
+    public sealed class Block
+    {
+        public readonly byte[] Data = new byte[512];
+    }
+}
\ No newline at end of file
diff --git a/SabreTools.Models/TAR/Entry.cs b/SabreTools.Models/TAR/Entry.cs
new file mode 100644
index 0000000..4241547
--- /dev/null
+++ b/SabreTools.Models/TAR/Entry.cs
@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+
+namespace SabreTools.Models.TAR
+{
+    public sealed class Entry
+    {
+        /// <summary>
+        /// Entry header
+        /// </summary>
+        public Header? Header { get; set; }
+
+        /// <summary>
+        /// 0 or more blocks representing the content
+        /// </summary>
+        public List<Block>? Blocks { get; set; }
+    }
+}
\ No newline at end of file