diff --git a/oracletrace/tracer.py b/oracletrace/tracer.py
index bf948cc..11ef97e 100644
--- a/oracletrace/tracer.py
+++ b/oracletrace/tracer.py
@@ -127,31 +127,21 @@ def _is_user_code(self, filename: str) -> bool:
         filename = os.path.realpath(filename)
         root_path = os.path.realpath(self._root_path)
 
-        # Check project root (commonpath raises ValueError on Windows when
-        # the paths sit on different drives — a different drive is outside)
-        try:
-            if os.path.commonpath([root_path, filename]) != root_path:
-                return False
-        except ValueError:
+        # Check project root
+        if os.path.commonpath([root_path, filename]) != root_path:
             return False
 
-        # Exclude Python stdlib (a different drive cannot be the stdlib)
+        # Exclude Python stdlib
         stdlib_path = os.path.realpath(sysconfig.get_path("stdlib"))
-        try:
-            if os.path.commonpath([stdlib_path, filename]) == stdlib_path:
-                return False
-        except ValueError:
-            pass
+        if os.path.commonpath([stdlib_path, filename]) == stdlib_path:
+            return False
 
         # Exclude all site-packages
         site_paths = site.getsitepackages() + [site.getusersitepackages()]
         normalized_site_paths = [os.path.realpath(p) for p in site_paths]
         for sp in normalized_site_paths:
-            try:
-                if os.path.commonpath([sp, filename]) == sp:
-                    return False
-            except ValueError:
-                continue
+            if os.path.commonpath([sp, filename]) == sp:
+                return False
 
         # Exclude venv-like directories that may be inside the project root
         venv_markers = {"venv", ".venv", "env", ".env", "virtualenv"}
diff --git a/tests/test_tracer.py b/tests/test_tracer.py
index a0a2c32..07e1889 100644
--- a/tests/test_tracer.py
+++ b/tests/test_tracer.py
@@ -110,42 +110,3 @@ def test_root_path_with_trailing_slash(tracer):
     user_file = os.path.join(tracer._root_path, "module.py")
     Path(user_file).touch()
     assert tracer._is_user_code(user_file)
-
-
-def test_file_on_another_drive_is_ignored_not_fatal(tracer, monkeypatch):
-    # On Windows, os.path.commonpath raises ValueError when the two paths
-    # sit on different drives; a file on another drive is simply not part
-    # of the project. Simulated so the guard is exercised on every OS.
-    real_commonpath = os.path.commonpath
-
-    def commonpath(paths):
-        if any("OTHER_DRIVE" in str(p) for p in paths):
-            raise ValueError("Paths don't have the same drive")
-        return real_commonpath(paths)
-
-    monkeypatch.setattr(os.path, "commonpath", commonpath)
-    assert not tracer._is_user_code(os.path.join("OTHER_DRIVE", "script.py"))
-
-
-def test_stdlib_and_site_on_another_drive_do_not_crash(tracer, monkeypatch):
-    # Interpreter installed on C:, project on F: — the stdlib/site-packages
-    # comparisons raise ValueError for every project file, which used to
-    # kill tracing entirely. A different drive cannot be the stdlib.
-    import site
-    import sysconfig
-
-    real_commonpath = os.path.commonpath
-
-    def commonpath(paths):
-        if any("OTHER_DRIVE" in str(p) for p in paths):
-            raise ValueError("Paths don't have the same drive")
-        return real_commonpath(paths)
-
-    monkeypatch.setattr(os.path, "commonpath", commonpath)
-    monkeypatch.setattr(sysconfig, "get_path", lambda name: os.path.join("OTHER_DRIVE", "stdlib"))
-    monkeypatch.setattr(site, "getsitepackages", lambda: [os.path.join("OTHER_DRIVE", "site-packages")])
-    monkeypatch.setattr(site, "getusersitepackages", lambda: os.path.join("OTHER_DRIVE", "user-site"))
-
-    user_file = os.path.join(tracer._root_path, "module.py")
-    Path(user_file).touch()
-    assert tracer._is_user_code(user_file)