diff --git a/web/src/Disks.tsx b/web/src/Disks.tsx
index 74680ea..a74f76b 100644
--- a/web/src/Disks.tsx
+++ b/web/src/Disks.tsx
@@ -73,8 +73,10 @@ function SmartPanel({ dev, rotational }: { dev: string; rotational: boolean }) {
 }
 
 // ---- device card ----
-function DeviceCard({ d, live }: { d: StorageDevice; live?: { read_bps: number; write_bps: number; util_pct: number } }) {
-  const [open, setOpen] = useState(false)
+function DeviceCard({ d, live, forceOpen }: { d: StorageDevice; live?: { read_bps: number; write_bps: number; util_pct: number }; forceOpen: boolean | null }) {
+  const [own, setOwn] = useState(false)
+  const open = forceOpen ?? own
+  const setOpen = (v: boolean) => setOwn(v)
   return (
     <section className="card disk">
       <div className="sub-head">
@@ -93,7 +95,7 @@ function DeviceCard({ d, live }: { d: StorageDevice; live?: { read_bps: number;
         </div>
       ))}
       {d.parts.length === 0 && <div className="muted">No partitions.</div>}
-      <div className="svc-actions"><button className="btn" onClick={() => setOpen(!open)}>{open ? 'Hide SMART' : 'SMART'}</button></div>
+      {forceOpen === null && <div className="svc-actions"><button className="btn" onClick={() => setOpen(!open)}>{open ? 'Hide SMART' : 'SMART'}</button></div>}
       {open && <SmartPanel dev={d.name} rotational={d.rotational} />}
     </section>
   )
@@ -179,6 +181,7 @@ export default function Disks() {
   const [live, setLive] = useState<Sample | null>(null)
   const [err, setErr] = useState('')
   const [task, setTask] = useState<string | null>(null)
+  const [allSmart, setAllSmart] = useState<boolean>(() => localStorage.getItem('hamlab.disks.smart') === '1')
   const rate = useRefreshMs()
 
   const load = useCallback(async () => {
@@ -205,13 +208,14 @@ export default function Disks() {
       <div className="dash-bar">
         <h2 className="section">Devices · {devs.length}</h2>
         <span className="spacer" />
+        {hasSmart && <button className={'chip' + (allSmart ? ' on' : '')} title="show SMART for every drive" onClick={() => { const v = !allSmart; setAllSmart(v); localStorage.setItem('hamlab.disks.smart', v ? '1' : '0') }}>{allSmart ? 'SMART: all open' : 'SMART: show all'}</button>}
         {!hasSmart && <Btn className="btn" onClick={async () => { try { const t = await api.installPackages(['smartmontools']); setTask(t.id) } catch (e) { toast(e instanceof Error ? e.message : 'failed', 'err') } }}>Install smartmontools</Btn>}
         <Btn className="btn" title="reload" onClick={load}>↻</Btn>
       </div>
       {!hasSmart && <div className="notice">SMART health needs smartmontools on this host. Install it with the button, then reload.</div>}
       {task && <TaskOutput id={task} onDone={(t) => { toast(`${t.title}: ${t.exit_code === 0 ? 'finished' : `exited ${t.exit_code}`}`, t.exit_code === 0 ? 'ok' : 'err'); load() }} />}
       <div className="cards">
-        {devs.map((d) => <DeviceCard key={d.name} d={d} live={liveFor(d.name)} />)}
+        {devs.map((d) => <DeviceCard key={d.name} d={d} live={liveFor(d.name)} forceOpen={allSmart ? true : null} />)}
       </div>
 
       <div className="dash-bar"><h2 className="section">ZFS</h2></div>