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From: Josh Paetzel <josh@tcbug.org>
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Date: Sat, 21 Oct 2006 23:57:13 -0500
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Subject: Re: non-ATA66 cable?
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On Saturday 21 October 2006 23:46, Juha Saarinen wrote:
> On 10/22/06, David Kelly <dkelly@hiwaay.net> wrote:
> > Dell PowerEdge 400SC, 6.2-PRERELEASE (altho this is an old issue)
> >
> > dmesg says:
> >
> > acd0: DMA limited to UDMA33, controller found non-ATA66 cable
> > acd0: DVDR <LITE-ON DVDRW SOHW-1633S/BS0K> at ata1-master UDMA33
> > cd0: 33.000MB/s transfers
> >
> > The controller is properly probed as, "atapci0: <Intel ICH5
> > UDMA100 controller>"
> >
> > This DVD isn't writing discs as fast as other brands on other
> > machines and OS's (such as MacOS X). Lite-On has a newer firmware
> > that I have not tried. But first was checking for any sort of
> > errors or irregularities and came across this mismatch.
> >
> > Lite-On says "Supported transfer mode : PIO mode 4, DMA mode 2
> > and Ultra DMA mode 2", so is there something I should do to my
> > FreeBSD to make this device happier?
>
> Try a different cable?

It's not going to come up faster than UDMA33....and even if it did 
UDMA33 is far faster than a DVD burner.

What sort of write performance are you getting?

-- 
Thanks,

Josh Paetzel