wait, you mean "sudo shred /dev/sda1 &"?
$ python
Python 2.7.6
Type "help", "copyright", "credits" or "license" for more information.
>>> import random
>>> print(''.join([chr(random.randint(32,255))
for x in range(50)]).decode("latin-1"))
¿IBÄõq½¦Áºn}@õÖhzUÌÓQ£m5ë¢ümÇ®=ÇƪLÛHt
[1] https://docs.python.org/3/library/random.html?highlight=rand... (There's no such hint for the 2.x docs, but I'm guessing it was just added later for clarification)
[2] https://docs.python.org/3/library/random.html?highlight=rand...
dd if=/dev/zero of=/dev/sda bs=1M &