diff --git a/mt.c b/mt.c
index f570596..690e95c 100644
--- a/mt.c
+++ b/mt.c
@@ -228,11 +228,21 @@ static struct densities {
     {0x49, "SDLT320"},
     {0x4a, "SDLT600, T10000A"},
     {0x4b, "T10000B"},
+    {0x4c, "T10000C"},
+    {0x4d, "T10000D"},
     {0x51, "IBM 3592 J1A"},
     {0x52, "IBM 3592 E05"},
+    {0x53, "IBM 3592 E06"},
+    {0x54, "IBM 3592 E07"},
+    {0x55, "IBM 3592 E08"},
     {0x58, "LTO-5"},
     {0x5a, "LTO-6"},
     {0x5c, "LTO-7"},
+    {0x71, "IBM 3592 J1A, encrypted"},
+    {0x72, "IBM 3592 E05, encrypted"},
+    {0x73, "IBM 3592 E06, encrypted"},
+    {0x74, "IBM 3592 E07, encrypted"},
+    {0x75, "IBM 3592 E08, encrypted"},
     {0x80, "DLT 15GB uncomp. or Ecrix"},
     {0x81, "DLT 15GB compressed"},
     {0x82, "DLT 20GB uncompressed"},