# Buggy code
def load_dir_cache(self, checksum):
    path_info = self.checksum_to_path_info(checksum)

    fobj = tempfile.NamedTemporaryFile(delete=False)
    path = fobj.name
    to_info = self.path_cls(path)
    self.cache.download([path_info], [to_info], no_progress_bar=True)

    try:
        with open(path, "r") as fobj:
            d = json.load(fobj)
    except ValueError:
        logger.exception("Failed to load dir cache '{}'".format(path_info))
        return []
    finally:
        os.unlink(path)

    if not isinstance(d, list):
        msg = "dir cache file format error '{}' [skipping the file]"
        logger.error(msg.format(os.path.relpath(path)))
        return []

    for info in d:
        # NOTE: here is a BUG, see comment to .as_posix() below
        relpath = self.path_cls.from_posix(info[self.PARAM_RELPATH])
        info[self.PARAM_RELPATH] = relpath.fspath

    return d


# Traceback (ValueError)
ERROR: failed to pull data from the cloud - path is on mount 'F:', start on mount 'C:'
Traceback (most recent call last):
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\command\data_sync.py", line 46, in
do_run recursive=self.args.recursive,
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\repo\pull.py", line 24, in pull
recursive=recursive,
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\repo\fetch.py", line 27, in fetch
used, jobs, remote=remote, show_checksums=show_checksums
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\data_cloud.py", line 144, in pull
show_checksums=show_checksums,
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 493, in pull
download=True,
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 459, in _process
download=download,
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 358, in status
local_exists = self.cache_exists(md5s)
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 232, in cache_exists
return list(filter(lambda md5: not self.changed_cache_file(md5), md5s))
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 232, in <lambda>
return list(filter(lambda md5: not self.changed_cache_file(md5), md5s))
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\base.py", line 518, in changed_cache_file
actual = self.get_checksum(cache_info)
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\base.py", line 275, in get_checksum
checksum = self.get_file_checksum(path_info)
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\remote\local\__init__.py", line 208, in get_file_checksum
return file_md5(path_info.path)[0]
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\site-packages\dvc\utils\__init__.py", line 48, in file_md5                      logger.info(msg.format(os.path.relpath(fname)))
File "c:\users\srg\appdata\local\continuum\anaconda3\envs\tf-keras\lib\ntpath.py", line 584, in relpath
path_drive, start_drive))                                                                                                                        ValueError: path is on mount 'F:', start on mount 'C:'

# Fixed code
def load_dir_cache(self, checksum):
    path_info = self.checksum_to_path_info(checksum)

    fobj = tempfile.NamedTemporaryFile(delete=False)
    path = fobj.name
    to_info = self.path_cls(path)
    self.cache.download([path_info], [to_info], no_progress_bar=True)

    try:
        with open(path, "r") as fobj:
            d = json.load(fobj)
    except ValueError:
        logger.exception("Failed to load dir cache '{}'".format(path_info))
        return []
    finally:
        os.unlink(path)

    if not isinstance(d, list):
        msg = "dir cache file format error '{}' [skipping the file]"
        logger.error(msg.format(relpath(path)))
        return []

    for info in d:
        # NOTE: here is a BUG, see comment to .as_posix() below
        relative_path = self.path_cls.from_posix(info[self.PARAM_RELPATH])
        info[self.PARAM_RELPATH] = relative_path.fspath

    return d