non-ATA66 cable?

Juha Saarinen juhasaarinen at
Sun Oct 22 04:46:46 UTC 2006

On 10/22/06, David Kelly <dkelly at> 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?



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