/dev/one for writing all 1's to a disk

Last Modified: Thu, 24 Dec 2009 19:55:55 +0000 ; Created: Thu, 24 Dec 2009 19:55:55 +0000

I found the following command online for writing all 1's to a disk:

tr '\0' '\377' < /dev/zero | dd bs=64K of=/dev/sdz