diff --git a/corrlib/cache_io.py b/corrlib/cache_io.py
new file mode 100644
index 0000000..4d1d632
--- /dev/null
+++ b/corrlib/cache_io.py
@@ -0,0 +1,33 @@
+from typing import Union, Optional
+import os
+import shutil
+
+
+def drop_cache_files(path: str, fs: Optional[list[str]]=None):
+    cache_dir = os.path.join(path, ".cache")
+    if fs is None:
+        fs = os.listdir(cache_dir)
+    for f in fs:
+        shutil.rmtree(os.path.join(cache_dir, f))
+
+
+def cache_dir(path, file):
+    cache_path_list = [path]
+    cache_path_list.append(".cache")
+    cache_path_list.extend(file.split("/")[1:])
+    cache_path = "/".join(cache_path_list)
+    return cache_path
+
+
+def cache_path(path, file, hash, key):
+    cache_path = os.path.join(cache_dir(path, file), hash, key)
+    return cache_path
+
+def is_in_cache(path, record, hash):
+    
+    if os.file.exists(cache_path(path, file, hash, key)):
+        return True
+    else:
+        return False
+    
+    
\ No newline at end of file
diff --git a/corrlib/meas_io.py b/corrlib/meas_io.py
index fca5671..ad9a6e8 100644
--- a/corrlib/meas_io.py
+++ b/corrlib/meas_io.py
@@ -4,14 +4,15 @@ import datalad.api as dl
 import sqlite3
 from .input import sfcf,openQCD
 import json
-from typing import Union
+from typing import Union, Optional
 from pyerrors import Obs, Corr, dump_object, load_object
 from hashlib import sha256, sha1
-from .tools import cached
+from .tools import cached, record2name_key
 import shutil
+from .caching import cache_path, cache_dir
 
 
-def write_measurement(path, ensemble, measurement, uuid, code, parameter_file=None):
+def write_measurement(path, ensemble, measurement, uuid, code, parameter_file: Optional[str]=None):
     """
     Write a measurement to the backlog.
     If the file for the measurement already exists, update the measurement.
@@ -115,7 +116,7 @@ def load_record(path: str, meas_path: str):
     return load_records(path, [meas_path])[0]
 
 
-def load_records(path: str, meas_paths: list[str], preloaded = {}) -> list[Union[Corr, Obs]]:
+def load_records(path: str, record_paths: list[str], preloaded = {}) -> list[Union[Corr, Obs]]:
     """
     Load a list of records by their paths.
 
@@ -131,11 +132,10 @@ def load_records(path: str, meas_paths: list[str], preloaded = {}) -> list[Union
     List
     """
     needed_data: dict[str, list[str]] = {}
-    for mpath in meas_paths:
-        file = mpath.split("::")[0]
+    for rpath in record_paths:
+        file, key = record2name_key(rpath)
         if file not in needed_data.keys():
             needed_data[file] = []
-        key = mpath.split("::")[1]
         needed_data[file].append(key)
     returned_data: list = []
     for file in needed_data.keys():
@@ -153,19 +153,6 @@ def load_records(path: str, meas_paths: list[str], preloaded = {}) -> list[Union
     return returned_data
 
 
-def cache_dir(path, file):
-    cache_path_list = [path]
-    cache_path_list.append(".cache")
-    cache_path_list.extend(file.split("/")[1:])
-    cache_path = "/".join(cache_path_list)
-    return cache_path
-
-
-def cache_path(path, file, key):
-    cache_path = os.path.join(cache_dir(path, file), key)
-    return cache_path
-
-
 def preload(path: str, file: str):
     dl.get(os.path.join(path, file), dataset=path)
     filedict = pj.load_json_dict(os.path.join(path, file))
@@ -196,7 +183,3 @@ def drop_record(path: str, meas_path: str):
     else:
         raise ValueError("This measurement does not exist as a file!")
 
-def drop_cache(path: str):
-    cache_dir = os.path.join(path, ".cache")
-    for f in os.listdir(cache_dir):
-        shutil.rmtree(os.path.join(cache_dir, f))
diff --git a/corrlib/tools.py b/corrlib/tools.py
index 3ac8bfe..44697cc 100644
--- a/corrlib/tools.py
+++ b/corrlib/tools.py
@@ -16,3 +16,9 @@ def m2k(m):
 
 def k2m(k):
     return (1/(2*k))-4
+
+
+def record2name_key(record_path: str):
+    file = record_path.split("::")[0]
+    key = record_path.split("::")[1]
+    return file, key
\ No newline at end of file