Re: ATA anomaly Question

[Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>]

On Sun, Mar 20, 2005 at 03:31:28AM +0800, Bill Hacker wrote:
> >    Typically the cable is reversed (motherboard side is connected to the
> >    drive and the drive side is connected to the motherboard) when the
> >    message occurs for a standard PATA drive and the cable is 
> >    UDMA-capable.
> 
> Most sockets & headets are keyed (blocked pin position) to prevent
> that (at least on the better cables I try to use). Ground leads 'float'
> at one end, are collected at the other end, IIRC.

The problem is that you can indead use both sides for UDMA33 and slower,
but need to use the correct side for UDMA66+. IIRC it was related to the
different timing of signals, but I might be wrong.

Joerg