DVD Burning

Chris Meyers chris at hddesign.com
Fri Nov 21 06:52:17 PST 2003

On Thu, 2003-11-20 at 15:30, Charles Swiger wrote:
> Right, but the acd device ['man 4 acd'] and the cd device ['man 4 cd'] 
> are not the same-- that's what the CAM subsystem is for, to provide 
> passthrough emulation for ATAPI devices so that you can send SCSI 
> commands to them.  The "burncd" program works with ATAPI devices 
> directly; the programs with dvd+rw-tools need CAM.

I mostly get what you are talking about here, but I'm not sure what this
means in my situation. Sorry.

> Hmm, also you should be configuring your device to enable UltraDMA 
> modes rather than PIO; try a "sysctl hw.ata.atapi_dma=1", or equivalent 
> in /etc/sysctl.conf or /boot/loader.conf.

When I try that sysctl command I get this:

# sysctl hw.ata.atapi_dma=1
sysctl: oid 'hw.ata.atapi_dma' is read only

The same thing shows up at boot when I have the 'hw.ata.atapi_dma=1'
part in /etc/sysctl.conf

Charles, I appreciate all your help so far, and I hope that I'm not
frustrating you too much.

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