Re: WD_QUIRK_FORCE_LBA48

[Michael van Elst <mlelstv%serpens.de@localhost>]

On Wed, Dec 16, 2009 at 06:38:35PM +0100, Manuel Bouyer wrote:
> On Wed, Dec 16, 2009 at 06:31:34PM +0100, Christoph Egger wrote:
> > 
> > Western Digital brings new disks to the market which
> > use 4KByte sectors instead of 512 byte.
> 
> This problem has also been raised a long time ago, with magneto-optical
> devices with 1k sectors. I think we still don't handle this
> (and it's not a problem limited to the ata drivers, the upper levels
> are affected too)

Those drives still present 512 byte 'logical sectors' to the host.
You need proper data alignment (standard is to start a partition
on sector 63) to avoid a significant speed penalty.


-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."