Den 24-Jul-00 12:40:40 skrev Vojtech Pavlik fĝlgende om "Re: VIA IDE driver, v1.5 (final)":
>On Mon, Jul 24, 2000 at 12:54:53AM +0200, Pavel Machek wrote:
>> > :)))))))) It'd be like this if you let UDMA/66 enabled on a 40-wire
>> > cable. What I meant is that after a *single* CRC error the speed would be
>> > lowered to the next lower step (UDMA 100, 66, 44, 33, 16) and if even
>> > UDMA/16 doesn't work, then fall back to PIO.
>>
>> That seems wrong. If you have server capable of UDMA/66 and you run it
>> for year or so, you are likely to find it in PIO mode. Not good.
>No. You're not supposed to get CRC errors with UDMA. Not a single one.
>If you do, it'd mean you'd get data corruption without the CRCs.
Which is irrelevant because UDMA _has_ the CRC check, unlike PIO, SDMA
and MDMA modes, where transfer errors would go undetected and cause fs
corruption or data corruption.
Regards,
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