The manual says PIO 4 mode should get about 16.6 Mb/s, UDMA 2 33 Mb/s,
and UDMA 4 66 Mb/s. Does anyone know what the correct numbers I should
be seeing in linux? (/w hdparm -t)
Again, my hardware is:
Quantum Fireball KA 13.6 7200 rpm HD
Abit BE6 /w integrated HPT366 chip
Kernel 2.4.3
Thanks,
David St.Clair
On 09 Apr 2001 19:39:23 -0700, Nicholas Knight wrote:
> ----- Original Message -----
> From: "David St.Clair" <dstclair@cs.wcu.edu>
> To: <linux-kernel@vger.kernel.org>
> Sent: Saturday, April 07, 2001 10:36 AM
> Subject: UDMA(66) drive coming up as UDMA(33)?
>
>
> > I'm trying to get my hard drive to use UDMA/66. I'm thinking the cable
> > is not being detected. When the HPT366 bios is set to UDMA 4; using
> > hdparm -t, I get a transfer rate of 19.51 MB/s. When the HPT366 bios is
> > set to PIO 4 the transfer rate is the same. Is this normal for a UDMA/66
> > drive? What makes me think something is wrong is that the log says
>
> The speed is dependant on the drive, and has absilutely nothing to do with
> the UDMA mode, beyond that the controller and cable need to be able to
> support at least the speed the drive is recieving/outputting data in order
> for the drive to operate at full speed, 19.51MB/sec sounds right for a good
> 7200RPM HDD
>
> >
> > "ide2: BM-DMA at 0xbc00-0xbc07, BIOS settings: hde:pio" <-- PIO?
>
> hmm this is a little odd but I don't know the ins and outs of the HPT366
> controller
>
> >
> > and
> >
> > "hde: 27067824 sectors (13859 MB) w/371KiB Cache, CHS=26853/16/63,
> > UDMA(33)" <--- UDMA(33)? shouldn't it be UDMA(66)?
> >
>
> this certainly sounds like it's not detecting the cable properly... have you
> tried replacing it with a new cable that you KNOW supports ATA/66?
>
>
> > HPT366: onboard version of chipset, pin1=1 pin2=2
>
> is the HPT366 controller in an add-in card or built into the motherboard? it
> looks like it's builtin from this line
>
> the bottom line here is that the cable probably isn't being detected
> properly for some reason, I doubt if it's a kernel problem, the cable is
> probably "bad", try picking up a new ATA/66+ cable and putting it in there
> this shouldn't actually cause you problems unless you're often transferring
> more than 33MB/sec though, which isn't likely on a desktop system, ATA/66
> and ATA/100 are *generaly* overkill for most desktop systems, even for many
> powerusers
-
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