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    SubjectRe: Linux 2.6.3-rc3 - IDE DMA errors on Thinkpad A30
    On Sun, 15 Feb 2004 23:09:52 EST, Jeff Garzik said:
    > 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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