diff --git a/jupyverse_api/jupyverse_api/contents/__init__.py b/jupyverse_api/jupyverse_api/contents/__init__.py
index 4296e29b..8edbd615 100644
--- a/jupyverse_api/jupyverse_api/contents/__init__.py
+++ b/jupyverse_api/jupyverse_api/contents/__init__.py
@@ -1,7 +1,7 @@
 import asyncio
 from abc import ABC, abstractmethod
 from pathlib import Path
-from typing import Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 from fastapi import APIRouter, Depends, Request, Response
 
@@ -15,6 +15,7 @@
 class FileIdManager(ABC):
     stop_watching_files: asyncio.Event
     stopped_watching_files: asyncio.Event
+    Change: Any
 
     @abstractmethod
     async def get_path(self, file_id: str) -> str:
diff --git a/plugins/contents/fps_contents/fileid.py b/plugins/contents/fps_contents/fileid.py
index f489c59d..b6af9f2e 100644
--- a/plugins/contents/fps_contents/fileid.py
+++ b/plugins/contents/fps_contents/fileid.py
@@ -35,9 +35,11 @@ class FileIdManager(metaclass=Singleton):
     initialized: asyncio.Event
     watchers: Dict[str, List[Watcher]]
     lock: asyncio.Lock
+    Change = Change
 
-    def __init__(self, db_path: str = ".fileid.db"):
+    def __init__(self, db_path: str = ".fileid.db", root_dir: str = "."):
         self.db_path = db_path
+        self.root_dir = root_dir
         self.initialized = asyncio.Event()
         self.watchers = {}
         self.watch_files_task = asyncio.create_task(self.watch_files())
@@ -90,7 +92,7 @@ async def watch_files(self):
         # index files
         async with self.lock:
             async with aiosqlite.connect(self.db_path) as db:
-                async for path in Path().rglob("*"):
+                async for path in Path(self.root_dir).rglob("*"):
                     idx = uuid4().hex
                     mtime = (await path.stat()).st_mtime
                     await db.execute(
@@ -99,14 +101,16 @@ async def watch_files(self):
                 await db.commit()
                 self.initialized.set()
 
-        async for changes in awatch(".", stop_event=self.stop_watching_files):
+        async for changes in awatch(self.root_dir, stop_event=self.stop_watching_files):
             async with self.lock:
                 async with aiosqlite.connect(self.db_path) as db:
                     deleted_paths = set()
                     added_paths = set()
                     for change, changed_path in changes:
                         # get relative path
-                        changed_path = Path(changed_path).relative_to(await Path().absolute())
+                        changed_path = Path(changed_path).relative_to(
+                            await Path(self.root_dir).absolute()
+                        )
                         changed_path_str = str(changed_path)
 
                         if change == Change.deleted:
@@ -156,9 +160,16 @@ async def watch_files(self):
             for change in changes:
                 changed_path = change[1]
                 # get relative path
-                relative_changed_path = str(Path(changed_path).relative_to(await Path().absolute()))
+                relative_changed_path = Path(changed_path).relative_to(
+                    await Path(self.root_dir).absolute()
+                )
                 relative_change = (change[0], relative_changed_path)
-                for watcher in self.watchers.get(relative_changed_path, []):
+                all_watchers = []
+                for path, watchers in self.watchers.items():
+                    p = Path(path)
+                    if p == relative_changed_path or p in relative_changed_path.parents:
+                        all_watchers += watchers
+                for watcher in all_watchers:
                     watcher.notify(relative_change)
 
         self.stopped_watching_files.set()
diff --git a/plugins/yjs/fps_yjs/ydocs/ydrive.py b/plugins/yjs/fps_yjs/ydocs/ydrive.py
new file mode 100644
index 00000000..d7066b3d
--- /dev/null
+++ b/plugins/yjs/fps_yjs/ydocs/ydrive.py
@@ -0,0 +1,138 @@
+from __future__ import annotations
+
+from contextlib import AsyncExitStack
+from functools import partial
+from pathlib import Path
+from typing import Any, Callable
+
+from anyio import create_task_group
+from anyio.abc import TaskGroup
+from pycrdt import Doc, Map, MapEvent
+
+from jupyverse_api.auth import User
+from jupyverse_api.contents import Contents
+
+from .ybasedoc import YBaseDoc
+
+
+class YDrive(YBaseDoc):
+    _starting: bool
+    _task_group: TaskGroup | None
+
+    def __init__(
+            self,
+            contents: Contents,
+            ydoc: Doc | None = None,
+            root_dir: Path | str | None = None,
+        ):
+        super().__init__(ydoc)
+        self._root_dir = Path() if root_dir is None else Path(root_dir)
+        self._ydoc["content"] = self._ycontent = self._new_dir_content()
+        self._ycontent.observe_deep(self._callback)
+        self._user = User()
+        self._starting = False
+        self._task_group = None
+        self._contents = contents
+        self._watcher = contents.file_id_manager.watch(".")
+
+    async def __aenter__(self) -> YDrive:
+        if self._task_group is not None:
+            raise RuntimeError("YDrive already running")
+
+        async with AsyncExitStack() as exit_stack:
+            tg = create_task_group()
+            self._task_group = await exit_stack.enter_async_context(tg)
+            self._exit_stack = exit_stack.pop_all()
+
+        assert self._task_group is not None
+        self._task_group.start_soon(self._process_file_changes)
+
+        return self
+
+    async def _process_file_changes(self):
+        async for change in self._watcher:
+            change_, path = change
+            if change_ == self._contents.file_id_manager.Change.deleted:
+                parent_content = self._get(path.parent)
+                del parent_content["content"][path.name]
+
+    async def __aexit__(self, exc_type, exc_value, exc_tb):
+        if self._task_group is None:
+            raise RuntimeError("YDrive not running")
+
+        self._task_group.cancel_scope.cancel()
+        self._task_group = None
+        return await self._exit_stack.__aexit__(exc_type, exc_value, exc_tb)
+
+    def _callback(self, events):
+        for event in events:
+            if isinstance(event, MapEvent):
+                current = self._ycontent
+                for path in event.path:
+                    current = current[path]
+                for key, val in event.keys.items():
+                    if val.get("action") == "delete":
+                        path = "/".join(event.path[1::2] + [key])
+                        self._task_group.start_soon(self._contents.delete_content, path, self._user)
+
+    @property
+    def version(self) -> str:
+        return "1.0.0"
+
+    def _new_dir_content(self) -> Map:
+        return Map({"is_dir": True, "content": None})
+
+    def _new_file_content(self, size: int) -> Map:
+        return Map({"is_dir": False, "size": size})
+
+    def _get_directory_content(self, path: Path) -> Map:
+        res = {}
+        for entry in (self._root_dir / path).iterdir():
+            if entry.is_dir():
+                res[entry.name] = self._new_dir_content()
+            else:
+                stat = entry.stat()
+                res[entry.name] = self._new_file_content(
+                    size=stat.st_size,
+                )
+        return Map(res)
+
+    def _maybe_populate_dir(self, path: Path, content: Map):
+        if content["content"] is None:
+            content["content"] = self._get_directory_content(path)
+
+    def _get(self, path: Path | str | None = None) -> Map:
+        path = Path() if path is None else Path(path)
+        current_content = self._ycontent
+        self._maybe_populate_dir(path, self._ycontent)
+        cwd = Path()
+        last_idx = len(path.parts) - 1
+        for idx, part in enumerate(path.parts):
+            try:
+                current_content = current_content["content"][part]
+            except KeyError:
+                raise FileNotFoundError(f'No entry "{part}" in "{cwd}".')
+            if current_content["is_dir"]:
+                cwd /= part
+                self._maybe_populate_dir(cwd, current_content)
+            elif idx < last_idx:
+                raise RuntimeError(f'Entry "{part}" in "{cwd}" is not a directory.')
+        return current_content
+
+    def get(self, path: Path | str | None = None) -> dict:
+        return dict(self._get(path))
+
+    def delete(self, path: Path | str):
+        path = Path(path) if isinstance(path, str) else path
+        if not path.parts:
+            raise RuntimeError("Cannot delete root directory")
+        parent_content = self._get(path.parent)
+        del parent_content["content"][path.name]
+
+    def set(self, value) -> None:
+        raise RuntimeError("Cannot set a YDrive")
+
+    def observe(self, callback: Callable[[str, Any], None]) -> None:
+        self.unobserve()
+        self._subscriptions[self._ystate] = self._ystate.observe(partial(callback, "state"))
+        self._subscriptions[self._ycontent] = self._ycontent.observe_deep(partial(callback, "content"))
diff --git a/plugins/yjs/pyproject.toml b/plugins/yjs/pyproject.toml
index d395ae81..b9ed2871 100644
--- a/plugins/yjs/pyproject.toml
+++ b/plugins/yjs/pyproject.toml
@@ -8,10 +8,18 @@ description = "An FPS plugin for the Yjs API"
 keywords = [ "jupyter", "server", "fastapi", "plugins" ]
 requires-python = ">=3.8"
 dependencies = [
-    "pycrdt >=0.3.4,<0.4.0",
+    "anyio >=3.6.2,<5",
+    "pycrdt >=0.7.2,<0.8.0",
     "jupyverse-api >=0.1.2,<1",
 ]
 dynamic = [ "version",]
+
+[project.optional-dependencies]
+test = [
+    "pytest",
+    "fps-contents",
+]
+
 [[project.authors]]
 name = "Jupyter Development Team"
 email = "jupyter@googlegroups.com"
diff --git a/plugins/yjs/tests/conftest.py b/plugins/yjs/tests/conftest.py
new file mode 100644
index 00000000..af7e4799
--- /dev/null
+++ b/plugins/yjs/tests/conftest.py
@@ -0,0 +1,6 @@
+import pytest
+
+
+@pytest.fixture
+def anyio_backend():
+    return "asyncio"
diff --git a/plugins/yjs/tests/fake_contents.py b/plugins/yjs/tests/fake_contents.py
new file mode 100644
index 00000000..1abbc66a
--- /dev/null
+++ b/plugins/yjs/tests/fake_contents.py
@@ -0,0 +1,14 @@
+from anyio import create_memory_object_stream
+from anyio.streams.stapled import StapledObjectStream
+from fps_contents.fileid import FileIdManager
+
+
+class Contents:
+    def __init__(self, db_path, root_dir):
+        send_stream, recv_stream = create_memory_object_stream[str]()
+        self.event_stream = StapledObjectStream(send_stream, recv_stream)
+        self.file_id_manager = FileIdManager(db_path=db_path, root_dir=root_dir)
+        self.watcher = self.file_id_manager.watch(".")
+
+    async def delete_content(self, path, user):
+        await self.event_stream.send(f"delete {path}")
diff --git a/plugins/yjs/tests/test_ydocs.py b/plugins/yjs/tests/test_ydocs.py
new file mode 100644
index 00000000..a38780ec
--- /dev/null
+++ b/plugins/yjs/tests/test_ydocs.py
@@ -0,0 +1,69 @@
+import tempfile
+from pathlib import Path
+
+import pytest
+from anyio import sleep
+from fake_contents import Contents
+from fps_yjs.ydocs.ydrive import YDrive
+
+
+@pytest.mark.anyio
+async def test_ydrive():
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        tmp_dir = Path(tmp_dir)
+        (tmp_dir / "file0").write_text(" " * 1)
+        (tmp_dir / "file1").write_text(" " * 2)
+        (tmp_dir / "dir0").mkdir()
+        (tmp_dir / "dir0" / "file2").write_text(" " * 3)
+        (tmp_dir / "dir1").mkdir()
+        (tmp_dir / "dir1" / "dir2").mkdir()
+        (tmp_dir / "dir1" / "dir2" / "file3").write_text(" " * 4)
+        (tmp_dir / "dir1" / "dir2" / "file4").write_text(" " * 5)
+
+        contents = Contents(db_path=str(tmp_dir / ".fileid.db"), root_dir=str(tmp_dir))
+
+        async with YDrive(contents=contents, root_dir=tmp_dir) as ydrive:
+
+            with pytest.raises(FileNotFoundError):
+                ydrive.get("doesnt_exist")
+
+            root_dir = ydrive.get()
+            assert len(root_dir["content"]) == 4
+            assert "file0" in root_dir["content"]
+            assert "file1" in root_dir["content"]
+            assert "dir0" in root_dir["content"]
+            assert "dir1" in root_dir["content"]
+
+            dir0 = ydrive.get("dir0")
+            assert len(dir0["content"]) == 1
+            assert "file2" in dir0["content"]
+
+            dir1 = ydrive.get("dir1")
+            assert len(dir1["content"]) == 1
+            assert "dir2" in dir1["content"]
+
+            dir2 = ydrive.get("dir1/dir2")
+            assert len(dir2["content"]) == 2
+            assert "file3" in dir2["content"]
+            assert "file4" in dir2["content"]
+            assert dict(dir1["content"]["dir2"]["content"]["file3"]) == {"is_dir": False, "size": 4}
+
+            # the fake contents actually doesn't delete files
+            path = "file0"
+            ydrive.delete(path)
+            assert await contents.event_stream.receive() == f"delete {path}"
+            path = "dir1/dir2/file3"
+            ydrive.delete(path)
+            assert await contents.event_stream.receive() == f"delete {path}"
+
+            await contents.file_id_manager.initialized.wait()
+            await sleep(0.1)
+            assert "file1" in root_dir["content"]
+            (tmp_dir / "file1").unlink()
+            await sleep(0.2)
+            assert "file1" not in root_dir["content"]
+
+            assert "file4" in dir2["content"]
+            (tmp_dir / "dir1" / "dir2" / "file4").unlink()
+            await sleep(0.1)
+            assert "file4" not in dir2["content"]