On Sat, 01 Jul 2000, you wrote:
> Dave Cotton wrote:
> >
> > I also have spent a frustrating week with UDMA problems including a
> > totally unreadable disk (corrupted superblock).
> > With Mandrake 7.0 and a UDMA 33 motherboard HDPARM reported 16MB/s with
> > my WD205AA now with 7.1 this is down to less than 5MB/s. With the drive
> > on my UDMA66 motherboard this drops to 3.5MB/s If I use DMA etc. I get a
> > corrupted superblock. I cut the speed of the bus by 5% and that seems to
> > have stopped the corruption.
> > If you run hdparm -t /dev/hda with dma set there is a stream of seek and
> > crc errors until the system resets the controller and disables dma.
> >
> > My question is what is your processor and motherboard. I have AMD 400
> > and 500s and DFI P5BV3+ and K6XV3+/66 mbs.
> >
>
> > Dave Cotton
> > Linux Autrement
> > Avignon France
> > +33 (0)4 90 16 07 89
>
>
> If you search the archives for UDMA66 problems, you will find
> most complaints involve WD drives. There is a reason. WD drives
> have unusual timing requirements. 7.1 is the first MAndrake
> distro to support UDMA66 out of the box, and the timing might be
> a little too tight for the WDs. Also, WD does not actually use
> Cyclic Redundancy Check (CRC) protocol but rather fakes it and
> blows it off. The result is that there is nothing in the HDD
> hardware/firmware to block a data stream corrupted by timing
> chatter from being written to disk.
>
> THere is a program that sets WD drives for UDMA66 available for
> DL from WD, which might(tm) help.
>
> In the mean time, on kernel traffic, the discussion crops up from
> time to time that a possible solution is to restrict WD drives to
> PIO upon recognition. No conclusion has been reached, but the
> fact that such discussion is taking place should indicate
> something to everyone.
>
> Civileme
>
> And of course Promise has actually made a driver available for
> the HPT366 in source code. The driver may still need a few bugs
> located, but the future looks brighter for stable UDMA66.
Promise making a Linux driver for Highpoint, err???
Cheers,
--
/* Manuël Beunder. (aka MBr)
- http://how.to/sblive the SB Live! Linux page -
'You must be the change you wish to see in this world. -Gandi' */
