diff --git a/internal/storage/storage.go b/internal/storage/storage.go
index 5748781..3ccb6b6 100644
--- a/internal/storage/storage.go
+++ b/internal/storage/storage.go
@@ -220,7 +220,14 @@ func New(sudo bool) *Manager {
 	return &Manager{sudo: sudo, smartctl: ok, cache: map[string]Smart{}}
 }
 
-func (m *Manager) HasSmartctl() bool { return m.smartctl }
+// HasSmartctl re-probes when it was missing at startup, so an install from the Disks
+// tab takes effect without a daemon restart.
+func (m *Manager) HasSmartctl() bool {
+	if !m.smartctl {
+		_, m.smartctl = lookPath("smartctl")
+	}
+	return m.smartctl
+}
 
 func (m *Manager) run(ctx context.Context, args ...string) ([]byte, int, error) {
 	if p, ok := lookPath(args[0]); ok {
@@ -273,7 +280,7 @@ func (m *Manager) Smart(ctx context.Context, dev string, force bool) Smart {
 		s.Error = "unknown device"
 		return s
 	}
-	if !m.smartctl {
+	if !m.HasSmartctl() {
 		return s
 	}
 	m.mu.Lock()