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Date: Tue, 10 Sep 2002 01:01:36 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Rogier Wolff <R.E.Wolff@BitWizard.nl>
CC: Linus Torvalds <torvalds@transmeta.com>, Andrew Morton <akpm@zip.com.au>,
       Suparna Bhattacharya <suparna@in.ibm.com>, Jens Axboe <axboe@suse.de>,
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Subject: Re: One more bio for for floppy users in 2.5.33..
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Rogier Wolff wrote:
> 
> ...
> 
> Ehmm. I'm in the data-recovery business, and we seem to have lost
> the ability to recover the other 3k of a 4k page if one of the blocks
> is bad.
>
> And we're annoyed about the read-ahead trying to read blocks past
> a bad block without returning to the application.
> 

You can use the raw driver, or O_DIRECT against /dev/hdXX.  That
will give 512-byte granularity and no readahead.
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