Re: FW: Fastest possible UDMA - how?

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Fri Jan 10 2003 - 15:15:48 EST


On Fri, 2003-01-10 at 19:04, Manish Lachwani wrote:
> Take a look at the drive IDENTIFY data. From the ATA
> spec, it can be seen that word# 88 in the IDENTIFY
> data can help you find out the UDMA mode selected and
> UDMA mode supported.
>
> The UDMA mode supported is the maximum supported by
> the drive.

Not always true. There are a wide number of cases where the
UDMA mode being used is not the highest one the drive
or controller supports. The most simple example is if we
decide the cabling is not suitable for UDMA66 and higher.

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