FreeBSD acd0: FAILURE – unknown CMD (0x03) ILLEGAL REQUEST ASC=0x20 ascq = 0x00 Error and Solution

in Categories last updated December 22, 2009

I’ve installed X11 under FreeBSD operating systems using ports and rebooted the computer and I’m getting the following error:

acd0: FAILURE – unknown CMD (0x03) ILLEGAL REQUEST ASC=0x20 ascq = 0x00

How do I fix this problem?

You are getting error message because of your DVD/CD drive. You can run the following command to get rid of this problem

hal-disable-polling --device {/dev/CDDriveDeviceName}

If your CD drive name is acd0, enter:

hal-disable-polling --device /dev/acd0

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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