Re: hdparm and DMA

[Mike Dresser <mdresser_l@windsormachine.com>]

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?

Mike