diff --git a/chv-guest/build.sh b/chv-guest/build.sh
index df4a83c..6dbc7ef 100755
--- a/chv-guest/build.sh
+++ b/chv-guest/build.sh
@@ -172,6 +172,13 @@ if [ ! -f "$SCRIPT_DIR/chv-sync.sh" ]; then
   echo "缺少 chv-sync.sh（Gitea 双向同步脚本）：$SCRIPT_DIR" >&2
   exit 1
 fi
+# feat-chv-opt-landing（阶段 1）：数据盘挂载脚本缺失即失败
+#（与 chv-sync.sh 同款门：构建产物须含它，否则工作区落回
+# 系统盘、"独立持久" 只剩文档声称）。
+if [ ! -f "$SCRIPT_DIR/chv-data-mount.sh" ]; then
+  echo "缺少 chv-data-mount.sh（数据盘挂载脚本）：$SCRIPT_DIR" >&2
+  exit 1
+fi
 # 对齐 Muse P2：单元启动器 / broker / 浏览器子代理三脚本缺一即失败。
 for p2_script in chv-cell.py chv-broker.py chv-browser.py; do
   if [ ! -f "$SCRIPT_DIR/$p2_script" ]; then
@@ -281,11 +288,13 @@ VC_ARGS=(-a "$OUT/disk.raw"
   --run-command 'mkdir -p /app/work && chmod 1777 /app/work && test -d /app/work && [ "$(stat -c %a /app/work)" = "1777" ]'
   --copy-in "$SCRIPT_DIR/chv-sync.sh:/usr/local/bin/"
   --run-command 'mv /usr/local/bin/chv-sync.sh /usr/local/bin/chv-sync && chmod +x /usr/local/bin/chv-sync'
+  --copy-in "$SCRIPT_DIR/chv-data-mount.sh:/usr/local/bin/"
+  --run-command 'mv /usr/local/bin/chv-data-mount.sh /usr/local/bin/chv-data-mount && chmod +x /usr/local/bin/chv-data-mount'
   --copy-in "$SCRIPT_DIR/chv-cell.py:/usr/local/bin/"
   --copy-in "$SCRIPT_DIR/chv-broker.py:/usr/local/bin/"
   --copy-in "$SCRIPT_DIR/chv-browser.py:/usr/local/bin/"
   --run-command 'mv /usr/local/bin/chv-cell.py /usr/local/bin/chv-cell && mv /usr/local/bin/chv-broker.py /usr/local/bin/chv-broker && mv /usr/local/bin/chv-browser.py /usr/local/bin/chv-browser && chmod +x /usr/local/bin/chv-cell /usr/local/bin/chv-broker /usr/local/bin/chv-browser'
-  --run-command 'printf "runcmd:\n - systemctl restart ssh || service ssh restart || true\n - test -f /etc/chv/guest-env && chown chv:chv /etc/chv/guest-env || true\n - /usr/local/bin/chv-sync boot >>/var/log/chv-sync.log 2>&1 || true\n" > /etc/cloud/cloud.cfg.d/99-chv-sync.cfg'
+  --run-command 'printf "runcmd:\n - systemctl restart ssh || service ssh restart || true\n - test -f /etc/chv/guest-env && chown chv:chv /etc/chv/guest-env || true\n - /usr/local/bin/chv-data-mount >>/var/log/chv-data-mount.log 2>&1 || true\n - /usr/local/bin/chv-sync boot >>/var/log/chv-sync.log 2>&1 || true\n" > /etc/cloud/cloud.cfg.d/99-chv-sync.cfg'
   --run-command 'git config --system user.name chv && git config --system user.email chv@localhost && git config --system credential.helper store && git config --system init.defaultBranch main'
   --run-command "$GT_INSTALL_CMD"
   --run-command '/usr/local/bin/gt version > /app/guest-versions-gt.txt'
diff --git a/chv-guest/buildinfo.py b/chv-guest/buildinfo.py
index f3af51d..c56afa0 100644
--- a/chv-guest/buildinfo.py
+++ b/chv-guest/buildinfo.py
@@ -39,6 +39,8 @@ BASE_CONTENTS = [
     "/app/host.py", "gt", "chv-sync",
     # 对齐 Muse P2：nspawn 单元启动器 + broker + 浏览器子代理。
     "systemd-container", "chv-cell", "chv-broker", "chv-browser",
+    # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本。
+    "chv-data-mount",
 ]
 
 # 执行器默认内核 cmdline（config.py），构建产物须与它一起记录（B-12），
diff --git a/chv-guest/check_lockfile.py b/chv-guest/check_lockfile.py
index 98bd1b8..297cbaf 100644
--- a/chv-guest/check_lockfile.py
+++ b/chv-guest/check_lockfile.py
@@ -30,6 +30,9 @@ DECLARED_SOURCES = {
     "chv-cell": "repo_commit",
     "chv-broker": "repo_commit",
     "chv-browser": "repo_commit",
+    # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本，版本随
+    # repo_commit（与 chv-sync 同款）。
+    "chv-data-mount": "repo_commit",
 }
 
 
diff --git a/chv-guest/chv-data-mount.sh b/chv-guest/chv-data-mount.sh
new file mode 100755
index 0000000..19c1936
--- /dev/null
+++ b/chv-guest/chv-data-mount.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# chv-data-mount：把数据盘（LABEL=CHVDATA）挂到 /home/chv/workspace。
+#
+# 由镜像 99-chv-sync.cfg runcmd 在 chv-sync boot 之前调（final 阶段，
+# 用户 chv 已存在，可 chown）。幂等：已挂载即返回；已有 CHVDATA
+# 标签的盘即直接挂；无数据盘（copy 模式旧 VM 没有第三块盘）即
+# 静默退出 0，不报错、不挡启动。
+#
+# 找盘不依赖 /dev/vd? 固定名：先按 LABEL 找；找不到则在所有整盘里
+# 找一块无文件系统、不是根盘的盘——seed ISO 有 iso9660，不会被选
+# 中；根盘本身无 fs，但按持有 / 分区的盘排除；分区（/dev/vda1 等）
+# 不参与（glob 只取整盘名）。
+#
+# 阶段 1（feat-chv-opt-landing）：工作区与浏览器 profile 的载体从
+# 系统盘 overlay 里剥离出来，独立持久；快照只登记系统盘 overlay，
+# 数据盘不进快照（见 cloud/chv/disk.py）。
+set -u
+MOUNT=/home/chv/workspace
+LABEL=CHVDATA
+
+log() { echo "chv-data-mount: $*"; }
+
+mountpoint -q "$MOUNT" 2>/dev/null && { log "already mounted"; exit 0; }
+
+DEV=$(blkid -L "$LABEL" 2>/dev/null || true)
+if [ -z "$DEV" ]; then
+  ROOT_SRC=$(findmnt -n -o SOURCE / 2>/dev/null || echo "")
+  ROOT_DISK=$(printf '%s' "$ROOT_SRC" | sed -e 's/p[0-9]*$//' -e 's/[0-9]*$//')
+  for d in /dev/vd[a-z] /dev/sd[a-z] /dev/xvd[a-z]; do
+    [ -b "$d" ] || continue
+    [ "$d" = "$ROOT_DISK" ] && continue
+    TYPE=$(blkid -o value -s TYPE "$d" 2>/dev/null || echo none)
+    [ "$TYPE" = "none" ] || continue
+    DEV=$d
+    break
+  done
+fi
+
+[ -n "$DEV" ] || { log "no data disk found, skip"; exit 0; }
+if [ "$(blkid -o value -s LABEL "$DEV" 2>/dev/null || echo "")" != "$LABEL" ]; then
+  log "formatting $DEV as $LABEL"
+  mkfs.ext4 -L "$LABEL" "$DEV" || { log "mkfs failed on $DEV"; exit 0; }
+fi
+mkdir -p "$MOUNT"
+mount "LABEL=$LABEL" "$MOUNT" || { log "mount failed"; exit 0; }
+chown chv:chv "$MOUNT" || true
+log "mounted $DEV -> $MOUNT"
+exit 0
diff --git a/chv-guest/generate_lockfile.py b/chv-guest/generate_lockfile.py
index 8876799..c72ee64 100644
--- a/chv-guest/generate_lockfile.py
+++ b/chv-guest/generate_lockfile.py
@@ -51,6 +51,9 @@ DECLARED_SOURCES = {
     "chv-cell": "repo_commit",
     "chv-broker": "repo_commit",
     "chv-browser": "repo_commit",
+    # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本，版本随
+    # repo_commit（与 chv-sync 同款）。
+    "chv-data-mount": "repo_commit",
 }
 
 
diff --git a/cloud/tests/test_chv_muse_p2.py b/cloud/tests/test_chv_muse_p2.py
index 2ca4069..7c7559e 100644
--- a/cloud/tests/test_chv_muse_p2.py
+++ b/cloud/tests/test_chv_muse_p2.py
@@ -568,7 +568,8 @@ class BuildDryRunTest(unittest.TestCase):
             os.makedirs(os.path.join(bindir, "codex-resources"))
             for name in ("build.sh", "buildinfo.py", "check_lockfile.py",
                          "generate_lockfile.py", "chv-sync.sh",
-                         "chv-cell.py", "chv-broker.py", "chv-browser.py"):
+                         "chv-cell.py", "chv-broker.py", "chv-browser.py",
+                         "chv-data-mount.sh"):
                 shutil.copy2(ROOT / "chv-guest" / name,
                              os.path.join(guest, name))
             shutil.copy2(ROOT / "host.py", os.path.join(repo, "host.py"))
diff --git a/cloud/tests/test_chv_opt_stage1.py b/cloud/tests/test_chv_opt_stage1.py
index dc3418d..a0ba225 100644
--- a/cloud/tests/test_chv_opt_stage1.py
+++ b/cloud/tests/test_chv_opt_stage1.py
@@ -653,5 +653,55 @@ class PersistentPoolTest(ChvOpt1Case):
         self.assertEqual(len(self.launches), 1)
 
 
+# -- 数据盘挂载脚本与构建接线 ----------------------------------------------
+class DataMountScriptTest(unittest.TestCase):
+    def _repo(self, *parts):
+        return os.path.join(
+            Path(__file__).resolve().parents[2], *parts)
+
+    def test_mount_script_present_and_safe(self):
+        path = self._repo("chv-guest", "chv-data-mount.sh")
+        with open(path) as fh:
+            text = fh.read()
+        self.assertIn("LABEL=CHVDATA", text)
+        self.assertIn("/home/chv/workspace", text)
+        self.assertIn("mkfs.ext4", text)
+        # 无数据盘即静默退出 0，不挡启动；绝不含任何秘密值。
+        self.assertIn("no data disk found, skip", text)
+        for secret in ("GITEA_TOKEN", "sk-", "password"):
+            self.assertNotIn(secret, text)
+
+    def test_build_sh_wires_mount_script(self):
+        with open(self._repo("chv-guest", "build.sh")) as fh:
+            text = fh.read()
+        self.assertIn("chv-data-mount.sh:/usr/local/bin/", text)
+        self.assertIn("chv-data-mount >>/var/log/chv-data-mount.log",
+                      text)
+        # 挂载在 chv-sync boot 之前（工作区须先挂好再 clone）：
+        # 以 99-chv-sync.cfg 那一行为准（文件头注释里也出现
+        # chv-sync boot 字样，不能全文 index 比对）。
+        cfg_line = next(
+            line for line in text.splitlines()
+            if "99-chv-sync.cfg" in line and "runcmd" in line)
+        self.assertLess(cfg_line.index("chv-data-mount >>"),
+                        cfg_line.index("chv-sync boot"))
+
+    def test_lockfile_declares_mount_script(self):
+        import importlib.util
+        guest = self._repo("chv-guest")
+        spec = importlib.util.spec_from_file_location(
+            "stage1_buildinfo", os.path.join(guest, "buildinfo.py"))
+        buildinfo = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(buildinfo)
+        self.assertIn("chv-data-mount", buildinfo.BASE_CONTENTS)
+        for name in ("check_lockfile.py", "generate_lockfile.py"):
+            spec = importlib.util.spec_from_file_location(
+                "stage1_" + name[:-3], os.path.join(guest, name))
+            mod = importlib.util.module_from_spec(spec)
+            spec.loader.exec_module(mod)
+            self.assertEqual(mod.DECLARED_SOURCES["chv-data-mount"],
+                             "repo_commit")
+
+
 if __name__ == "__main__":
     unittest.main()