Messages in this thread | | | Date | Wed, 12 Mar 2003 22:28:46 +0100 | From | Andries Brouwer <> | Subject | Re: bio too big device |
| |
On Wed, Mar 12, 2003 at 05:59:03PM +0000, Linus Torvalds wrote:
> >We have seen *zero* drives that do not understand 256 sector commands. > >Maybe such drives exist, but so far there is zero evidence. > > That is definitely not true. We definitely _have_ had drives that > misconstrue the 256-sector case. It's been a long time, but they > definitely exist.
I disagree. If you have any proof, please show it.
Let me repeat: We have seen *zero* drives that do not understand 256 sector commands.
We have seen *one* drive (a six years old Maxtor 7850AV) that could not sustain heavy load with max # secs set to 256, while it behaved better with max set to 255.
But we have seen lots of old old drives that show all kinds of errors.
> The right limit for IDE is 255 sectors, and doing 256 sectors WILL fail > on some setups.
Paul remarked: "So the 255 (or even the old 128) fixes things vs. 256, but I'd feel better being 100% sure why. Is 255 a "fix" or a perturbation that happens to paper over something else?"
I think there is no good reason to limit us to 255 sectors.
(And no reason for blacklists either - there is just no good evidence that something is systematically wrong with 256 sectors for any brand or model. Things would change if a second Maxtor 7850AV owner could confirm.)
Andries
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |