diff --git a/health-check.sh b/health-check.sh
index 073c84d..739bbcb 100755
--- a/health-check.sh
+++ b/health-check.sh
@@ -48,6 +48,22 @@ if [ "$IS_SPOKE" = false ] && [ "$IS_HUB" = false ]; then
     exit 1
 fi
 
+check_disk() {
+    header "Disk Space"
+    while IFS= read -r line; do
+        local pct mount
+        pct=$(echo "$line" | awk '{print $5}' | tr -d '%')
+        mount=$(echo "$line" | awk '{print $6}')
+        if [ "$pct" -ge 90 ]; then
+            fail "Disk usage at ${pct}% on $mount — critically low"
+        elif [ "$pct" -ge 80 ]; then
+            warn "Disk usage at ${pct}% on $mount — getting full"
+        else
+            ok "Disk usage at ${pct}% on $mount"
+        fi
+    done < <(df -h | awk 'NR>1 && $6 !~ /^(\/dev|\/sys|\/proc|\/run|\/snap)/ {print}')
+}
+
 check_common() {
     header "System"
 
@@ -202,6 +218,7 @@ check_hub() {
 }
 
 check_common
+check_disk
 
 if [ "$IS_SPOKE" = true ]; then
     check_spoke