diff --git a/modules/hosts/shadow/disks.nix b/modules/hosts/shadow/disks.nix
index cdd2207..3c44698 100644
--- a/modules/hosts/shadow/disks.nix
+++ b/modules/hosts/shadow/disks.nix
@@ -7,19 +7,23 @@
   # definitions, nor produce duplicates for whichever data drives happened to
   # be mounted at the time it ran.
   flake.nixosModules.shadowDisks = {...}: let
-    # Secondary data drive, addressed by filesystem label.
+    # Secondary data drives, addressed by filesystem label.
     #
-    # noauto + x-systemd.automount makes systemd generate an .automount unit and
-    # mount on first access to the path rather than at boot — the two 2.7T
-    # spinners stay parked until something actually touches them. idle-timeout
-    # unmounts them again once quiet so they can spin back down.
-    #
-    # nofail matters even with automount: it stops a missing or dying disk from
-    # becoming a failed dependency that drops the boot into emergency mode.
+    # nofail on all of them: it stops a missing or dying disk from becoming a
+    # failed boot dependency that drops the machine into emergency mode.
     #
     # On-disk ownership is already ahmza mode 755 on all three, so no uid mapping
     # is needed — ext4 stores ownership in the filesystem and ignores uid=/gid=.
-    dataDrive = label: {
+
+    # Spinning disks (sda/sdc, both WD, rotational=1). noauto +
+    # x-systemd.automount makes systemd generate an .automount unit and mount on
+    # first access to the path rather than at boot, so they stay parked until
+    # something actually touches them; idle-timeout unmounts them again once
+    # quiet so they can spin back down.
+    #
+    # Note the idle unmount fails with "target is busy" while any shell has its
+    # cwd inside the mount. That is harmless — it simply stays mounted and retries.
+    spinningDrive = label: {
       device = "/dev/disk/by-label/${label}";
       fsType = "ext4";
       options = [
@@ -30,6 +34,25 @@
         "x-systemd.device-timeout=10"
       ];
     };
+
+    # Always-on drive. Used for the games library: it is an SSD (Samsung 870 QVO,
+    # rotational=0) so there is no spin-down to gain, and a Steam library is
+    # better off never sitting behind an automount trigger.
+    #
+    # Unrelated but worth knowing, since it looks like a mount problem: Steam's
+    # FHS sandbox builds its bind list at launch by iterating /*, so a top-level
+    # directory that does not exist when Steam starts is invisible to that
+    # instance for its whole lifetime, and Steam reports it as "not writable".
+    # /mnt only comes into existence when these entries are activated, so Steam
+    # must be restarted after a fresh boot-time change here.
+    eagerDrive = label: {
+      device = "/dev/disk/by-label/${label}";
+      fsType = "ext4";
+      options = [
+        "nofail"
+        "x-systemd.device-timeout=10"
+      ];
+    };
   in {
     fileSystems = {
       # Boot essentials, by UUID. UUIDs rather than labels here on purpose:
@@ -46,9 +69,9 @@
         options = ["fmask=0077" "dmask=0077"];
       };
 
-      "/mnt/dump" = dataDrive "DUMP";
-      "/mnt/games" = dataDrive "GAMES";
-      "/mnt/bak" = dataDrive "BAK";
+      "/mnt/dump" = spinningDrive "DUMP";
+      "/mnt/bak" = spinningDrive "BAK";
+      "/mnt/games" = eagerDrive "GAMES";
     };
 
     swapDevices = [];