deltadownload results in OSError: [Errno 9] Bad file descriptor

[rducic]

I have 2 snapshots from same parent, an initial and a diff

Original
Snapshot ID
[snap-01e5f2fee19e08fae]
Size
500 GiB
Progress
Available (100%)
Snapshot status
Completed
Owner
387198252553
Volume ID
[vol-0b4c2a2591f78c536]
Started
Wed Aug 31 2022 11:42:19 GMT-0500 (Central Daylight Time)

2nd snapshot
Snapshot ID
[snap-01b3747942520453a]
Size
500 GiB
Progress
Available (100%)
Snapshot status
Completed
Owner
387198252553
Volume ID
[vol-0b4c2a2591f78c536]

When I do a diff I get
C:\flexible-snapshot-proxy\src/main.py diff snap-01e5f2fee19e08fae snap-0095db1e0578136bc
Changes between snap-01e5f2fee19e08fae and snap-0095db1e0578136bc contain 8 chunks and 4194304 bytes, took 0.15 seconds.

however DeltaDownload throws an error:

PS C:\flexible-snapshot-proxy\src/main.py deltadownload snap-01e5f2fee19e08fae snap-01b3747942520453a \.\PhysicalDrive2
Changes between snap-01e5f2fee19e08fae and snap-01b3747942520453a contain 8 chunks and 4194304 bytes, took 0.16 seconds.
['\\.\PhysicalDrive2']
C:\flexible-snapshot-proxy\src/main.py : Traceback (most recent call last):
At line:1 char:1

• C:\flexible-snapshot-proxy\src/main.py deltadownload snap-01e5f2fee19 ...

•   + CategoryInfo          : NotSpecified: (Traceback (most recent call last)::String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
  
  File "C:\flexible-snapshot-proxy\src\main.py", line 484, in <module>
    deltadownload(snapshot_id_one=args.snapshot_one, snapshot_id_two=args.snapshot_two, file_path=args.file_path)
  File "C:\flexible-snapshot-proxy\src\fsp.py", line 613, in deltadownload
    parallel(
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 1056, in __call__
    self.retrieve()
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 935, in retrieve
    self._output.extend(job.get(timeout=self.timeout))
  File "C:\Python310\lib\multiprocessing\pool.py", line 774, in get
    raise self._value
  File "C:\Python310\lib\multiprocessing\pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "C:\Python310\lib\site-packages\joblib\_parallel_backends.py", line 595, in __call__
    return self.func(*args, **kwargs)
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 262, in __call__
    return [func(*args, **kwargs)
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 262, in <listcomp>
    return [func(*args, **kwargs)
  File "C:\flexible-snapshot-proxy\src\fsp.py", line 388, in get_changed_blocks
    parallel2(
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 1056, in __call__
    self.retrieve()
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 935, in retrieve
    self._output.extend(job.get(timeout=self.timeout))
  File "C:\Python310\lib\multiprocessing\pool.py", line 774, in get
    raise self._value
  File "C:\Python310\lib\multiprocessing\pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "C:\Python310\lib\site-packages\joblib\_parallel_backends.py", line 595, in __call__
    return self.func(*args, **kwargs)
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 262, in __call__
    return [func(*args, **kwargs)
  File "C:\Python310\lib\site-packages\joblib\parallel.py", line 262, in <listcomp>
    return [func(*args, **kwargs)
  File "C:\flexible-snapshot-proxy\src\fsp.py", line 226, in get_changed_block
    write_block_to_file(file, block, data)
  File "C:\flexible-snapshot-proxy\src\fsp.py", line 177, in write_block_to_file
    f.write(data)
  

OSError: [Errno 9] Bad file descriptor