Re: Linux 2.6.3-rc3 - IDE DMA errors on Thinkpad A30

[Valdis . Kletnieks]

On Sun, 15 Feb 2004 23:09:52 EST, Jeff Garzik said:
> Valdis.Kletnieks@xxxxxx wrote:
> > On Sun, 15 Feb 2004 22:47:37 EST, Jeff Garzik said:

> >>to see if this sector is bad", and -hopefully- will unmark bad blocks 
> >>that were incorrectly marked bad.

That "hopefully" is the question here...

> Consider:  ext2 reads sector 1234.  drive returns "media error", and 
> then swaps the bad sector for a good one.  Reboot and run badblocks. 
> badblocks reads sector 1234, in whatever manner the drive chooses to 
> present sector 1234 to the OS.
> 
> "original" versus "redirected" block is invisible to the OS.  The OS 
> only knows that an event occured at a single point in time -- the media 
> error.

So it never sees the original incorrectly marked bad block, and thus can't
unmap it...  We'll never look at the original 1234 again and see that it was in
fact a good block, all we'll see is if the REPLACEMENT 1234 is good or bad.

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