about QNX6.2.1 installation!

each time i install the QNX 6.2.1(NC), i get a message"Unable to mount /dev/hd0 " after the hint “Restarting driver and mounting filesystem” then reboot! i don’t know why ,anybody can help me?thx!

Run up QNX from the CD and self check the CD with, dd if=/dev/cd0 count=485824 | cksum
Then compare the output with openqnx.com/Article116.html

I’m sorry,but how can I check the CD?

I don’t want to sound rude but hasn’t evanh already given you the command to run ?:

dd if=/dev/cd0 count=485824 | cksum

and compare the cksum output with openqnx.com/Article116.html