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    SubjectRe: Quick question about libata and hdparm
    Hi, Jeff.

    On Apr 19 2009, Jeff Garzik wrote:
    > Michael Tokarev wrote:
    >> Well, the kernel does a good job here in *almost* all cases.
    >> The problematic case is when a device has some bad/unreadable
    >> blocks/sectors. When such a place occurs on read, libata
    >> (or whatever it is) performs several retries, each time
    >> using "less aggressive" settings - like reducing UDMA and
    >> PIO mode till the lowest possible PIO/33. And the device
    >> stays in that mode until reboot, even if the problematic
    >> sector has been relocated. So it'd be nice to be able to
    >> reset the mode back in such cases.
    >
    > Do you have a log?

    I have a log here of libata reducing UDMA speed. I don't know if this is
    any hardware problem or not (I think not), but I do see libata
    complaining and reducing the speed of the drive.

    Would you like it?


    Thanks,

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