diff --git a/app/services/recording_service.py b/app/services/recording_service.py
index 041caf5..8c0e3e3 100644
--- a/app/services/recording_service.py
+++ b/app/services/recording_service.py
@@ -14,8 +14,8 @@
   }
 
 The data files themselves are named by the loggers from the same name:
-<name>.csv (fas_bridge), <name>_sensors.csv and <name>_actuators.csv
-(novaGround). ops/Nova.ps1 `archive` bundles all of them with the referenced
+FAS_<name>.csv (fas_bridge), novaGround_<name>_sensors.csv and
+novaGround_<name>_actuators.csv (novaGround). ops/Nova.ps1 `archive` bundles all of them with the referenced
 config snapshots.
 """
 from __future__ import annotations
@@ -39,10 +39,12 @@
 def recording_files(data_dir: Path, name: str) -> list[Path]:
     """Every file belonging to recording `name`.
 
-    Matches <name>.<ext> and <name>_<word>.<ext> but not <name>0... so that
-    "..._data_1" never claims "..._data_10_sensors.csv".
+    Matches [<logger>_]<name>.<ext> and [<logger>_]<name>_<word>.<ext> but not
+    <name>0... so that "..._data_1" never claims "..._data_10_sensors.csv".
+    A logger prefix is a word followed by "_"; recording names start with a
+    digit, so a prefix can never swallow another recording's name.
     """
-    pattern = re.compile(rf"^{re.escape(name)}(\.|_[A-Za-z])")
+    pattern = re.compile(rf"^([A-Za-z][A-Za-z0-9]*_)?{re.escape(name)}(\.|_[A-Za-z])")
     return sorted(p for p in data_dir.iterdir() if p.is_file() and pattern.match(p.name))
 
 
diff --git a/tests/test_fas_bridge_data_file.py b/tests/test_fas_bridge_data_file.py
new file mode 100644
index 0000000..1968051
--- /dev/null
+++ b/tests/test_fas_bridge_data_file.py
@@ -0,0 +1,40 @@
+"""FAS bridge data-file naming: every logger prefixes its files with its own name."""
+import importlib.util
+from pathlib import Path
+
+import pytest
+
+pytest.importorskip("serial")
+pytest.importorskip("paho.mqtt.client")
+
+_spec = importlib.util.spec_from_file_location(
+    "fas_bridge", Path(__file__).resolve().parents[1] / "tools" / "fas_bridge.py"
+)
+fas_bridge = importlib.util.module_from_spec(_spec)
+_spec.loader.exec_module(fas_bridge)
+
+
+@pytest.mark.parametrize(
+    "given, expected",
+    [
+        ("2026-10-04-14_data_0", "FAS_2026-10-04-14_data_0.csv"),
+        ("2026-10-04-14_data_0.csv", "FAS_2026-10-04-14_data_0.csv"),
+        ("FAS_2026-10-04-14_data_0", "FAS_2026-10-04-14_data_0.csv"),
+        (None, "FAS_data.csv"),
+    ],
+)
+def test_data_file_name_is_prefixed(given, expected) -> None:
+    assert fas_bridge.data_file_name(given) == expected
+
+
+def test_start_data_saving_writes_prefixed_file(tmp_path) -> None:
+    bridge = fas_bridge.FasBridge.__new__(fas_bridge.FasBridge)
+    bridge._data_dir = str(tmp_path)
+    bridge._record_file = None
+    import threading
+
+    bridge._record_lock = threading.Lock()
+    bridge._log = lambda *a, **k: None
+    bridge._cmd_data_file({"type": "data_file", "action": "start_data_saving", "filename": "r_data_0"})
+    bridge._cmd_data_file({"type": "data_file", "action": "stop_data_saving"})
+    assert [p.name for p in tmp_path.iterdir()] == ["FAS_r_data_0.csv"]
diff --git a/tests/test_station_config.py b/tests/test_station_config.py
index 133ea1e..e227368 100644
--- a/tests/test_station_config.py
+++ b/tests/test_station_config.py
@@ -138,6 +138,17 @@ def test_recording_files_does_not_claim_longer_names(tmp_path) -> None:
     ]
 
 
+def test_recording_files_includes_logger_prefixed_files(tmp_path) -> None:
+    for fname in [
+        "FAS_r_data_1.csv", "novaGround_r_data_1_sensors.csv", "novaGround_r_data_1_actuators.csv",
+        "novaGround_r_data_10_sensors.csv", "FAS_r_data_10.csv", "other_data_1.csv",
+    ]:
+        (tmp_path / fname).write_text("", encoding="utf-8")
+    assert [p.name for p in recording_files(tmp_path, "r_data_1")] == [
+        "FAS_r_data_1.csv", "novaGround_r_data_1_actuators.csv", "novaGround_r_data_1_sensors.csv",
+    ]
+
+
 def test_data_saving_publishes_the_recording_name(tmp_path) -> None:
     ctx = _context(tmp_path)
     calls: list[tuple] = []
diff --git a/tools/fas_bridge.py b/tools/fas_bridge.py
index 45af0eb..73a60da 100644
--- a/tools/fas_bridge.py
+++ b/tools/fas_bridge.py
@@ -1462,6 +1462,23 @@ def _resolve_fas_board_id(cmd: dict) -> int:
 
 
 # ─────────────────────────────────────────────────────────────────────────────
+DATA_FILE_PREFIX = "FAS"
+
+
+def data_file_name(filename) -> str:
+    """CSV name for a recording: `FAS_<recording>.csv`.
+
+    Every logger prefixes its files with its own name so the source is clear
+    in the shared data folder (novaGround: `novaGround_<recording>_sensors.csv`).
+    """
+    name = str(filename or "data")
+    if name.endswith(".csv"):
+        name = name[:-4]
+    if not name.startswith(DATA_FILE_PREFIX + "_"):
+        name = f"{DATA_FILE_PREFIX}_{name}"
+    return name + ".csv"
+
+
 class FasBridge:
     def __init__(self, port: str, baud: int, broker: str,
                  node_id: str, publish_ms: int, verbosity: int,
@@ -1602,16 +1619,13 @@ def _cmd_data_file(self, cmd: dict) -> None:
         """Start/stop recording ADC samples to a CSV in the bridge's data dir.
 
         Mirrors the backend's data-saving command:
-          {"type":"data_file","action":"start_data_saving","filename":"..._data_0"}
+          {"type":"data_file","action":"start_data_saving","filename":"<recording>"}
           {"type":"data_file","action":"stop_data_saving"}
         """
         action = str(cmd.get("action", "")).lower()
 
         if action == "start_data_saving":
-            filename = str(cmd.get("filename") or "fas_data")
-            if not filename.endswith(".csv"):
-                filename += ".csv"
-            path = os.path.join(self._data_dir, filename)
+            path = os.path.join(self._data_dir, data_file_name(cmd.get("filename")))
             try:
                 os.makedirs(self._data_dir, exist_ok=True)
                 f = open(path, "w", newline="", encoding="utf-8")