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

Posted on 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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