diff --git a/driveAtlas.sh b/driveAtlas.sh
index d03e664..b264d1f 100644
--- a/driveAtlas.sh
+++ b/driveAtlas.sh
@@ -89,28 +89,26 @@ generate_large1_layout() {
     local hostname=$1
     build_drive_map
 
+    # large1 has 3 stacks of 5 bays at front (15 total) + 2 M.2 slots
+    # Physical bay mapping TBD - current mapping is by controller order
     printf "┌─────────────────────────────────────────────────────────────────────────┐\n"
-    printf "│  %-69s  │\n" "$hostname - Custom Tower (3x4 Grid + Internal)"
+    printf "│  %-69s  │\n" "$hostname - Tower (3x5 Front Bays + 2x M.2)"
     printf "│                                                                         │\n"
-    printf "│  NVMe Slots:  M1: %-10s   M2: %-10s                          │\n" "${DRIVE_MAP[m2-1]:-EMPTY}" "${DRIVE_MAP[m2-2]:-EMPTY}"
+    printf "│  M.2 NVMe:  M1: %-10s   M2: %-10s                            │\n" "${DRIVE_MAP[m2-1]:-EMPTY}" "${DRIVE_MAP[m2-2]:-EMPTY}"
     printf "│                                                                         │\n"
-    printf "│  HBA Bays (SAS2008):                                                    │\n"
-    printf "│  ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐                    │\n"
-    printf "│  │1:%-8s│ │2:%-8s│ │3:%-8s│ │4:%-8s│                    │\n" "${DRIVE_MAP[1]:-EMPTY}" "${DRIVE_MAP[2]:-EMPTY}" "${DRIVE_MAP[3]:-EMPTY}" "${DRIVE_MAP[4]:-EMPTY}"
-    printf "│  └──────────┘ └──────────┘ └──────────┘ └──────────┘                    │\n"
-    printf "│  ┌──────────┐ ┌──────────┐ ┌──────────┐                                 │\n"
-    printf "│  │5:%-8s│ │6:%-8s│ │7:%-8s│                                 │\n" "${DRIVE_MAP[5]:-EMPTY}" "${DRIVE_MAP[6]:-EMPTY}" "${DRIVE_MAP[7]:-EMPTY}"
-    printf "│  └──────────┘ └──────────┘ └──────────┘                                 │\n"
-    printf "│                                                                         │\n"
-    printf "│  Internal SATA (AMD 16:00.1):                                           │\n"
-    printf "│  ┌──────────┐ ┌──────────┐ ┌──────────┐                                 │\n"
-    printf "│  │8:%-8s│ │9:%-8s│ │10:%-7s│                                 │\n" "${DRIVE_MAP[8]:-EMPTY}" "${DRIVE_MAP[9]:-EMPTY}" "${DRIVE_MAP[10]:-EMPTY}"
-    printf "│  └──────────┘ └──────────┘ └──────────┘                                 │\n"
-    printf "│                                                                         │\n"
-    printf "│  ASMedia SATA (25:00.0):                                                │\n"
-    printf "│  ┌──────────┐ ┌──────────┐                                              │\n"
-    printf "│  │11:%-7s│ │12:%-7s│                                              │\n" "${DRIVE_MAP[11]:-EMPTY}" "${DRIVE_MAP[12]:-EMPTY}"
-    printf "│  └──────────┘ └──────────┘                                              │\n"
+    printf "│  Front Bays (3 stacks x 5 rows):  [Bay mapping TBD]                     │\n"
+    printf "│     Stack A       Stack B       Stack C                                 │\n"
+    printf "│  ┌──────────┐  ┌──────────┐  ┌──────────┐                               │\n"
+    printf "│  │1:%-8s│  │2:%-8s│  │3:%-8s│                               │\n" "${DRIVE_MAP[1]:-EMPTY}" "${DRIVE_MAP[2]:-EMPTY}" "${DRIVE_MAP[3]:-EMPTY}"
+    printf "│  ├──────────┤  ├──────────┤  ├──────────┤                               │\n"
+    printf "│  │4:%-8s│  │5:%-8s│  │6:%-8s│                               │\n" "${DRIVE_MAP[4]:-EMPTY}" "${DRIVE_MAP[5]:-EMPTY}" "${DRIVE_MAP[6]:-EMPTY}"
+    printf "│  ├──────────┤  ├──────────┤  ├──────────┤                               │\n"
+    printf "│  │7:%-8s│  │8:%-8s│  │9:%-8s│                               │\n" "${DRIVE_MAP[7]:-EMPTY}" "${DRIVE_MAP[8]:-EMPTY}" "${DRIVE_MAP[9]:-EMPTY}"
+    printf "│  ├──────────┤  ├──────────┤  ├──────────┤                               │\n"
+    printf "│  │10:%-7s│  │11:%-7s│  │12:%-7s│                               │\n" "${DRIVE_MAP[10]:-EMPTY}" "${DRIVE_MAP[11]:-EMPTY}" "${DRIVE_MAP[12]:-EMPTY}"
+    printf "│  ├──────────┤  ├──────────┤  ├──────────┤                               │\n"
+    printf "│  │13:%-7s│  │14:%-7s│  │15:%-7s│                               │\n" "${DRIVE_MAP[13]:-EMPTY}" "${DRIVE_MAP[14]:-EMPTY}" "${DRIVE_MAP[15]:-EMPTY}"
+    printf "│  └──────────┘  └──────────┘  └──────────┘                               │\n"
     printf "└─────────────────────────────────────────────────────────────────────────┘\n"
 }