Re: WD_QUIRK_FORCE_LBA48

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Dec 14, 2009 at 11:59:44PM +0100, Manuel Bouyer wrote:
> On Mon, Dec 14, 2009 at 11:46:46PM +0100, Christoph Badura wrote:
> > On Mon, Dec 14, 2009 at 11:31:11PM +0100, Manuel Bouyer wrote:
> > > There are ATA-5 drives reporting LBA48 supports. LBA48 showed up before
> > > ATA-6 was out (like much features in ATA world, in fact).
> > 
> > So what exactly is the point you're trying to make?
> 
> That there are drives out there, which claim LBA48 support but are
> otherwise conform to the ATA-5 standart (not ATA-6) and so support
> reading sector 0xfffffff using LBA28. If you use the "clamp to 128GB"
> jumper they will report a capacity of 0x10000000 and not 0xfffffff.

On second though such jumper don't exists, extended capacity is read from
another register.

> Of course such drives are old enough to be connected to a controller
> which is old enough to not work properly with LBA48.

But I guess such drives would claim ATA-6 support anyway.
Well, I'm not sure what the right way to handle this is.
Maybe we should just drop support for such odd configuration and
just conform to standards.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--