diff --git a/frontend-modern/src/features/storageBackups/__tests__/diskPresentation.test.ts b/frontend-modern/src/features/storageBackups/__tests__/diskPresentation.test.ts
index cf98e27d5..9c1913ecb 100644
--- a/frontend-modern/src/features/storageBackups/__tests__/diskPresentation.test.ts
+++ b/frontend-modern/src/features/storageBackups/__tests__/diskPresentation.test.ts
@@ -234,6 +234,8 @@ describe('diskPresentation', () => {
       }),
     ).toBe('Pending sectors detected.');
     expect(getPhysicalDiskHealthStatus(makeDiskData({ health: 'UNKNOWN' })).label).toBe('Unknown');
+    // PVE reports SCSI/SAS drives as OK; older servers pass it through raw (#1595)
+    expect(getPhysicalDiskHealthStatus(makeDiskData({ health: 'OK' })).label).toBe('Healthy');
 
     expect(
       getPhysicalDiskEmptyStatePresentation({
diff --git a/frontend-modern/src/features/storageBackups/diskPresentation.ts b/frontend-modern/src/features/storageBackups/diskPresentation.ts
index f91f60aae..5002e6f94 100644
--- a/frontend-modern/src/features/storageBackups/diskPresentation.ts
+++ b/frontend-modern/src/features/storageBackups/diskPresentation.ts
@@ -188,6 +188,10 @@ const PHYSICAL_DISK_BAD_HEALTH_STATES = new Set([
   'UNHEALTHY',
 ]);
 
+// PVE reports SCSI/SAS drives as OK (ATA drives say PASSED); older server
+// builds pass that raw value through, so accept it here as well (#1595).
+const PHYSICAL_DISK_HEALTHY_STATES = new Set(['PASSED', 'GOOD', 'OK']);
+
 const normalizePhysicalDiskState = (value: string | undefined | null): string =>
   (value || '').trim().toLowerCase();
 
@@ -559,11 +563,10 @@ export function getPhysicalDiskHealthStatus(
   }
 
   return {
-    label: normalizedHealth === 'PASSED' || normalizedHealth === 'GOOD' ? 'Healthy' : 'Unknown',
-    summary:
-      normalizedHealth === 'PASSED' || normalizedHealth === 'GOOD'
-        ? 'No active disk-health issues.'
-        : 'Health state is not reported.',
+    label: PHYSICAL_DISK_HEALTHY_STATES.has(normalizedHealth) ? 'Healthy' : 'Unknown',
+    summary: PHYSICAL_DISK_HEALTHY_STATES.has(normalizedHealth)
+      ? 'No active disk-health issues.'
+      : 'Health state is not reported.',
     tone: 'text-base-content',
   };
 }
diff --git a/internal/monitoring/issue1595_pve_health_normalization_test.go b/internal/monitoring/issue1595_pve_health_normalization_test.go
new file mode 100644
index 000000000..c38574d0d
--- /dev/null
+++ b/internal/monitoring/issue1595_pve_health_normalization_test.go
@@ -0,0 +1,30 @@
+package monitoring
+
+import "testing"
+
+// PVE's disks/list endpoint reports ATA drives as PASSED/FAILED! and SCSI/SAS
+// drives as OK or a failure sentence. The raw OK previously reached the UI
+// untouched and rendered as Unknown (#1595).
+func TestNormalizeProxmoxDiskHealth(t *testing.T) {
+	cases := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"scsi ok", "OK", "PASSED"},
+		{"scsi ok lowercase", "ok", "PASSED"},
+		{"ata passed", "PASSED", "PASSED"},
+		{"ata failed bang", "FAILED!", "FAILED"},
+		{"scsi failure sentence", "FAILURE PREDICTION THRESHOLD EXCEEDED", "FAILED"},
+		{"unknown passthrough", "UNKNOWN", "UNKNOWN"},
+		{"empty passthrough", "", ""},
+		{"whitespace trimmed", "  OK  ", "PASSED"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := normalizeProxmoxDiskHealth(tc.in); got != tc.want {
+				t.Fatalf("normalizeProxmoxDiskHealth(%q) = %q, want %q", tc.in, got, tc.want)
+			}
+		})
+	}
+}
diff --git a/internal/monitoring/monitor_pve.go b/internal/monitoring/monitor_pve.go
index 44965dd76..f4850492e 100644
--- a/internal/monitoring/monitor_pve.go
+++ b/internal/monitoring/monitor_pve.go
@@ -1033,7 +1033,7 @@ func (m *Monitor) maybePollPhysicalDisksAsync(
 					WWN:      disk.WWN,
 					Type:     disk.Type,
 					Size:     disk.Size,
-					Health:   disk.Health,
+					Health:   normalizeProxmoxDiskHealth(disk.Health),
 					Wearout:  disk.Wearout,
 					RPM:      disk.RPM,
 					Used:     disk.Used,
@@ -1120,6 +1120,25 @@ func (m *Monitor) maybePollPhysicalDisksAsync(
 	}(instanceName, client, nodes, nodeEffectiveStatus, modelNodes)
 }
 
+// normalizeProxmoxDiskHealth maps the raw health strings the Proxmox disks API
+// reports onto the canonical PASSED/FAILED vocabulary the disk model carries.
+// ATA drives come back as PASSED or FAILED!, while SCSI/SAS drives report OK
+// or a failure sentence, and the raw OK previously rendered as Unknown in the
+// UI (#1595). Unrecognized values pass through untouched so nothing real is
+// masked.
+func normalizeProxmoxDiskHealth(health string) string {
+	trimmed := strings.TrimSpace(health)
+	upper := strings.ToUpper(trimmed)
+	switch {
+	case upper == "OK", strings.Contains(upper, "PASS"):
+		return "PASSED"
+	case strings.Contains(upper, "FAIL"):
+		return "FAILED"
+	default:
+		return trimmed
+	}
+}
+
 // physicalDisksFromHostAgentSMART builds PhysicalDisk entries for a node from
 // its linked host agent's SMART inventory. This is the fallback when the
 // Proxmox disks/list query fails: PVE probes SMART per disk inside that call,