task: metadata: install: pip install -e .[dev]
patch: diff --git a/google/cloud/storage/transfer_manager.py b/google/cloud/storage/transfer_manager.py
index 1b48cd9..15325df 100644
--- a/google/cloud/storage/transfer_manager.py
+++ b/google/cloud/storage/transfer_manager.py
@@ -885,6 +885,8 @@ def download_chunks_concurrently(
             "'checksum' is in download_kwargs, but is not supported because sliced downloads have a different checksum mechanism from regular downloads. Use the 'crc32c_checksum' argument on download_chunks_concurrently instead."
         )
 
+    download_kwargs = download_kwargs.copy()
+    download_kwargs["checksum"] = None
     download_kwargs["command"] = "tm.download_sharded"
 
     # We must know the size and the generation of the blob.

problem_statement: `download_chunks_concurrently` spams the log with INFO messages about checksum not being returned
#### Environment details

  - OS type and version: MacOS 14.7
  - Python version: 3.10.15
  - pip version: 24.2
  - `google-cloud-storage` version: 2.18.2

#### Steps to reproduce

  1. Use `transfer_manager.download_chunks_concurrently` API to download a large file from GCS
  2. A lot of INFO log messages should appear (for ~1GB file I get 30+):

```
INFO google.resumable_media._helpers - No MD5 checksum was returned from the service while downloading ...
(which happens for composite objects), so client-side content integrity checking is not being performed.
```

#### Code example

```python
url = "gs://..." # large object
client = storage.Client(
    credentials=credentials,
    project=project,
)
blob = Blob.from_string(url, client=client)
transfer_manager.download_chunks_concurrently(
    blob,
    filename,
)
```

I'm going to prepare a PR fixing this.
repo: googleapis/python-storage
test_cmd: pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
test_patch: diff --git a/tests/unit/test_transfer_manager.py b/tests/unit/test_transfer_manager.py
index cee83ba..09969b5 100644
--- a/tests/unit/test_transfer_manager.py
+++ b/tests/unit/test_transfer_manager.py
@@ -606,6 +606,7 @@ def test_download_chunks_concurrently():
 
     expected_download_kwargs = EXPECTED_DOWNLOAD_KWARGS.copy()
     expected_download_kwargs["command"] = "tm.download_sharded"
+    expected_download_kwargs["checksum"] = None
 
     with mock.patch("google.cloud.storage.transfer_manager.open", mock.mock_open()):
         result = transfer_manager.download_chunks_concurrently(
@@ -636,9 +637,6 @@ def test_download_chunks_concurrently_with_crc32c():
     blob_mock.size = len(BLOB_CONTENTS)
     blob_mock.crc32c = "eOVVVw=="
 
-    expected_download_kwargs = EXPECTED_DOWNLOAD_KWARGS.copy()
-    expected_download_kwargs["command"] = "tm.download_sharded"
-
     def write_to_file(f, *args, **kwargs):
         f.write(BLOB_CHUNK)
 
@@ -664,9 +662,6 @@ def test_download_chunks_concurrently_with_crc32c_failure():
     blob_mock.size = len(BLOB_CONTENTS)
     blob_mock.crc32c = "invalid"
 
-    expected_download_kwargs = EXPECTED_DOWNLOAD_KWARGS.copy()
-    expected_download_kwargs["command"] = "tm.download_sharded"
-
     def write_to_file(f, *args, **kwargs):
         f.write(BLOB_CHUNK)