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when faster random is needed, take this!

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero > randomfile.bin

.. suddenly the limit is not the CPU anymore, but the bus to the drive carrying the filesystem :)

and when one wants to see some numbers, add pv in between:

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero | pv -pterb > /dev/sdb

Don't be the product, buy the product!

Schweinderl