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From: "Aaron Burke" <aburke@nullplusone.com>
To: "Len Conrad" <LConrad@Go2France.com>, <questions@freebsd.org>
Subject: RE: can't get to ATA133
Date: Wed, 26 Feb 2003 15:55:08 -0800
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(snip)
> Subject: can't get to ATA133
> FreeBSD 4.7R
>
> Promise TX2000 with two ATA133 drives as ata masters using the ATA133 IDE
> cables that came with the TX2000.
>
> dmesg shows:
>
> ad4: DMA limited to UDMA33, non-ATA66 cable or device
> ad6: DMA limited to UDMA33, non-ATA66 cable or device
> ar0: 39083MB <ATA SPAN array> [4982/255/63] status: READY subdisks:
>   0 READY ad4: 39083MB <Maxtor 6Y040L0> [79408/16/63] at
> ata2-master UDMA33
> ar1: 39083MB <ATA SPAN array> [4982/255/63] status: READY subdisks:
>   0 READY ad6: 39083MB <Maxtor 6Y040L0> [79408/16/63] at
> ata3-master UDMA33
>
> Anybody know why TX sees only 33?
Seems that you are running 40 conductor IDE cables.
In order to get anything higher than UDMA33, you will
need to have an 80 conductor cable. These cables run
dual conductors to help reduce noise generated on the
cable itself.

>
> Len



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