diff --git a/lib/modules/partition/disks.nix b/lib/modules/partition/disks.nix
index ce726fb7..2a2c580c 100644
--- a/lib/modules/partition/disks.nix
+++ b/lib/modules/partition/disks.nix
@@ -12,7 +12,7 @@ let
     "udevadm trigger"
   ];
 
-  mkDiskType = osDisk: types.submodule (
+  mkDiskType = types.submodule (
     { config, name, ... }: {
       options = {
         id = mkOption {
@@ -30,18 +30,14 @@ let
         deviceName = mkOption {
           type = types.nullOr types.str;
           description = "The name of the device.";
-          default = if osDisk then null else name;
+          default = name;
         };
 
         devicePath = mkOption {
-          type =
-            if osDisk then
-              types.nullOr types.str
-            else
-              types.str;
+          type = types.nullOr types.str;
           description = "The path to the device.";
           default =
-            if osDisk && config.deviceName == null then
+            if config.deviceName == null then
               null
             else
               "/dev/${config.deviceName}";
@@ -78,7 +74,7 @@ let
 
           diskSelector = ''
             result="$(mktemp)"
-            fish ${./choose-disk.fish} "$result" "Which disk do you wish to install the OS on?" ${./select.fish}
+            fish ${./choose-disk.fish} "$result" "Please specify the \"${name}\" disk:" ${./select.fish}
             ${diskVarName}="$(cat "$result")"
           '';
 
@@ -173,29 +169,26 @@ let
             partitions);
         in
         {
-          id = if osDisk then "os" else "disk-${name}";
+          id = "disk-${name}";
           deviceVariable = diskVar;
 
           deviceScript =
-            if osDisk && config.devicePath == null then ''
+            if config.devicePath == null then ''
               ${diskSelector}
             '' else ''
               ${diskVarName}=${config.devicePath}
-              ${if osDisk then ''
-                if [ ! -b ${diskVar} ]; then
-                  function fallback() {
-                    echo "Couldn't find the specified disk \"${diskVar}\"."
-                    if fish ${./confirm.fish} "Do you want to install the OS on another disk?"; then
-                      ${diskSelector}
-                    else
-                      exit 1
-                    fi
-                  }
+              if [ ! -b ${diskVar} ]; then
+                function fallback() {
+                  echo "Couldn't find the specified disk \"${diskVar}\"."
+                  if fish ${./confirm.fish} "Do you want to choose a different \"${name}\" disk?"; then
+                    ${diskSelector}
+                  else
+                    exit 1
+                  fi
+                }
 
-                  fallback
-                fi
-              '' else
-                ""}
+                fallback
+              fi
             '';
 
           script = lib.mkDefault ''
@@ -299,13 +292,8 @@ in
         };
 
         diskSetup = {
-          osDisk = mkOption {
-            type = mkDiskType true;
-            description = "The partition layout of the OS disk.";
-          };
-
           disks = mkOption {
-            type = types.attrsOf (mkDiskType false);
+            type = types.attrsOf (mkDiskType);
             description = "The additional disks to format.";
             default = { };
           };
@@ -326,10 +314,9 @@ in
           let
             cfg = config.valhalla.fileSystems;
             inherit (cfg) rootDir;
-            inherit (cfg.diskSetup) osDisk;
             inherit (lib.strings) normalizePath;
             partPath = part: "/dev/disk/by-label/${part.label}";
-            disks = ([ osDisk ] ++ (builtins.attrValues cfg.diskSetup.disks));
+            disks = ((builtins.attrValues cfg.diskSetup.disks));
             partitions = (builtins.concatMap (_: (builtins.attrValues _.partitions)) disks);
 
             mountScript = lib.strings.concatLines (builtins.concatMap
diff --git a/profiles/machines/manuel/DerGeret/config.nix b/profiles/machines/manuel/DerGeret/config.nix
index 01422c85..55facd7e 100644
--- a/profiles/machines/manuel/DerGeret/config.nix
+++ b/profiles/machines/manuel/DerGeret/config.nix
@@ -25,7 +25,7 @@
         };
       };
 
-      fileSystems.diskSetup.osDisk.partitions = {
+      fileSystems.diskSetup.disks.OS.partitions = {
         # Keep Windows' boot partition
         Boot.keepExisting = true;
 
diff --git a/profiles/machines/manuel/Generic/config.nix b/profiles/machines/manuel/Generic/config.nix
index 379a72b9..6054c5f2 100644
--- a/profiles/machines/manuel/Generic/config.nix
+++ b/profiles/machines/manuel/Generic/config.nix
@@ -5,8 +5,8 @@ in {
 
   config = {
     valhalla = {
-      fileSystems.diskSetup = {
-        osDisk = {
+      fileSystems.diskSetup.disks = {
+        OS = {
           partitions = {
             Boot = {
               index = 1;
diff --git a/profiles/machines/manuel/server.nix b/profiles/machines/manuel/server.nix
index b245d3bf..a18d755c 100644
--- a/profiles/machines/manuel/server.nix
+++ b/profiles/machines/manuel/server.nix
@@ -5,8 +5,8 @@ in {
 
   config = {
     valhalla = {
-      fileSystems.diskSetup = {
-        osDisk = {
+      fileSystems.diskSetup.disks = {
+        OS = {
           partitions = {
             Boot = {
               index = 1;