Traceback (most recent call last):
  File "copy_flash.py", line 29, in <module>
    valid = [dev for dev in new_paths if (identify(dev[0]), dev[1].split("/")[-1]  in excluded) == (True, False)]
  File "copy_flash.py", line 29, in <listcomp>
    valid = [dev for dev in new_paths if (identify(dev[0]), dev[1].split("/")[-1]  in excluded) == (True, False)]
  File "copy_flash.py", line 19, in identify
    output = subprocess.check_output(["/bin/bash", "-c", command]).decode("utf-8")
  File "/usr/lib/python3.4/subprocess.py", line 620, in check_output
    raise CalledProcessError(retcode, process.args, output=output)
subprocess.CalledProcessError: Command '['/bin/bash', '-c', 'find /dev/disk -ls | grep /└─sdb1']' returned non-zero exit status 1