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    SubjectRe: [PATCH 3/5] libata: Implement disk shock protection support
    Alan Cox wrote:
    >> However, SATA or not, there simply isn't a way to abort commands in ATA.
    >> Issuing random command while other commands are in progress simply is
    >> state machine violation and there will be many interesting results
    >> including complete system lockup (ATA controller dying while holding the
    >> PCI bus). The only reliable way to abort in-flight commands are by
    >> issuing hardreset. However, ATA reset protocol is not designed for
    >> quick recovery. The machine is gonna hit the ground hard way before the
    >> reset protocol is complete.
    > Actually you cau can issue idle immediate on older ATA devices. I am not
    > clear if that was stuck back into the current accelerometer friendly
    > drives or not. Would need to check with IBLenovo

    Was that something intentional or was it a happy accident? There can be
    bus ownership problem on PATA and on SATA this is much more state logic
    on both sides of the cable and I think things like that would be more
    difficult to work accidentally.



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