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SubjectRe: UDMA Blacklist
On Mon, 4 Jan 1999 Philip.Blundell@pobox.com wrote:

> > I have a WD32500H 2.5gig drive.. it was bought in '95 or '96 .. and
> >it DOES NOT SUPPORT UDMA. The specs on www.wdc.com have NO mention of
> >UDMA. It does PIO Mode 4 and that's it. Yet it is blacklisted for UDMA
>
> If it's blacklisted that implies some versions of the drive firmware
> spuriously claimed to be able to do UDMA. If you know the drive can't support
> it then why are you worried about its blacklist status?

http://www.wdc.com/quality/err-rec.html

Drive Firmware Quality Upgrade

Updated November 11, 1996

During extensive quality testing procedures, Western Digital has
identified an error recovery issue that affects less than 0.1% of a
very specific group of WD Caviar hard drives. As part of our ongoing
commitment to quality, we have developed a drive firmware utility that
corrects the error recovery code in the WD Caviar hard drives listed
below. Even though this issue affects an extremely small number of
drives, we highly recommend that you upgrade your drive firmware using
this utility.
* AC11000 (1.0 GB)
* AC22100 (2.1 GB)
* AC32500 (2.5 GB)
* AC33100 (3.1 GB)

Since they do not change the name based on the firmware, then there is not
a clean way to flag fuzzy drives that may or may not work.

If it works, edit ./drivers/block/ide-dma.c and delete the offending line.
Better yet create a scheme for testing all various chipset/drive
combinations and impose speed limits.

I have the code for setting speed limits at boot, but it is not generally
called so it waits for 2.3.X

> p.
>
>
>
>
> -
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Cheers,
Andre Hedrick
The (NEW) Linux IDE guy
The APC UPS Specialist for Linux

http://www.dyer.vanderbilt.edu/server/udma/
http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.2.bin.tar.gz

You just need a bigger hammer, or learn how to swing the one you have better.
(C) me.....


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