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    SubjectRe: ATA 4 KiB sector issues.
    Date
    From: "Tejun Heo" <tj@kernel.org>
    Sent: Tuesday, 2010/March/16 20:44


    > Hello,
    >
    > On 03/17/2010 11:51 AM, Kevin Easton wrote:
    >> Can't we fix the problem by defaulting to aligning partitions to
    >> start on an LBA that is a multiple of 64260 ?
    >>
    >> Such partitions will always be 4KiB-aligned, *and* start-of-cylinder
    >> aligned (assuming 255/63, as seems to be the norm).
    >>
    >> Sure, that reduces your partition granularity to almost-32-MiB, but
    >> that's pretty small potatoes these days (and it's only a *default*, so
    >> you could always override that if you really cared, and didn't need
    >> the compatibility).
    >
    > The only thing we can gain by that is possible compatibility w/ very
    > old operating systems (<=w2k, BTW, it would be great if someone can
    > actually test it). Plus, breaking the first cylinder assumption might
    > not be always safe to begin with. I personally don't think it's
    > something worth departing from the behavior most vendors would assume
    > from now on (1MiB alignment). It should be enough and safer to
    > provide a mechanism to choose legacy alignment if someone is trying to
    > put something which is older than a decade there.
    >
    > Thanks.
    >
    > --
    > tejun

    WRT very old filesystems - it won't affect Amiga partition tables or
    the Amiga FFS. It already understands large block sizes natively. And
    that's MY definition of "old" with "very" in front of it.

    {^_^} Joanne Dow


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