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Re: hdparm and DMA



On Tue, Nov 19, 2002 at 09:40:38AM +1000, mdevin wrote:
> On Mon, Nov 18, 2002 at 12:47:09 -0500, Mike Dresser wrote:
> > On Tue, 19 Nov 2002, mdevin wrote:
> > 
> > > # hdparm -i /dev/hdc
> > > /dev/hdc:
> > >  Model=WDC WD400BB-32AUA1, FwRev=18.20D18, SerialNo=WD-WMA6R3707054
> > >  DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5
> > >
> > > # hdparm -i /dev/hda
> > > /dev/hda:
> > >  Model=WDC WD400JB-00ENA0, FwRev=05.03E05, SerialNo=WD-WMAD12312399
> > >  DMA modes: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4 udma5
> > 
> > Definately in non-ultradma mode, mdma2 is ... 16mbyte/sec?
> > 
> > See the DMA mode it's using?  I'd take a look at your cabling and routing
> > thereof.  What kind of cable is connected to the drive?  Can you take
> > this hard drive and stick it in the other computer, and see how it
> > performs, using the cable that is in the other computer?
> >
> My other computer is older and its motherboard doesn't have support for
> ATA133 (80pin cable), but I guess it would just be treated as ATA100.  I
> can't shut that one down at present though.

FYI: 

>From ATA66 onwards, or even ATA33, you  need the 80pin cable. 

		Roger. 

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