[Nottingham] Very slow dd if=/dev/random

Martin nottingham at mailman.lug.org.uk
Tue Jul 29 09:29:01 2003

I've just wiped a partially corrupt hdd superblock and all's well.

Meanwhile, I tried:
dd if=/dev/random of=/dev/hdg bs=1M

just for the sake of experimenting and...

it works, but incredibly slowly with one disk access every few minutes! 
dd spends most of its time sleeping.

So why doesn't this work at 10's MBytes a second?


Martin Lomas