This is ckdisk, a tool for writing a special pattern to a disk drive
verifying it afterwards -- for checking the device to work properly.

Background: I encountered strange behaviour of a Linux 2.4.* kernel
writing to / reading from a Compact Flash Card directly via IDE (not
USB wrapped). Well, ckdisk discovered that a byte written to a
given offset couldn't always be read again at from that offset :-(
I've never seen such things before, still investigating the problem...

The usage is: ckdisk [options] device
see the manual page for more information.

This program should be available at the metalab ftp site at
ftp://ibiblio.org/pub/Linux/utils/disk-management/.
