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    SubjectRe: ATA 4 KiB sector issues.
    On 03/08/2010 07:18 AM, Martin K. Petersen wrote:
    >
    > Tejun> Partitioners maybe should only align partitions which will be
    > Tejun> used by Linux and default to the traditional layout for others
    > Tejun> while allowing explicit override.
    >
    > I don't think we take the partition type into account. Karel?
    >

    We should not take the partition type into account. The other aspect is
    that FAT partitions need to be formatted differently to maintain the
    alignment once set; I have recently contributed patches (which were
    accepted) into mkdosfs to do the right thing there.

    Looking at the Windows XP article, it looks like it is limited to
    certain BIOSes; unfortunately it doesn't say what the particular BIOS
    issue is. If we can find a system which actually exhibits the bug it
    might be possible to reverse-engineer a solution.

    > Tejun> Reportedly, commonly used partitioners aren't ready to handle
    > Tejun> drives larger than 2 TiB in any configuration and alignment isn't
    > Tejun> done properly for drives with 4 KiB physical sectors. 4 KiB
    > Tejun> logical sector support is broken in both the kernel
    >
    > Huh, what? My homedir is on a 4KiB LBS/PBS drive and has been for ~2
    > years.

    For > 2 TiB drives with 4 KiB logical sectors and MS-DOS partition
    tables, it is.

    > Tejun> Unfortunately, the transition to 4 KiB sector size, physical only
    > Tejun> or logical too, is looking fairly ugly. Hopefully, a reasonable
    > Tejun> solution can be reached in not too distant future but even with
    > Tejun> all the software side updated, it looks like it's gonna cause
    > Tejun> significant amount of confusion and frustration.
    >
    > With regards to XP compatibility I don't think we should go too much out
    > of our way to accommodate it. XP has been disowned by its master and I
    > think virtualization will take care of the rest.

    I think that's is wildly optimistic, but I do observe there is a fix
    from Microsoft in the article you reference.

    > FWIW, recent fdisk has a command line flag that will enable/disable DOS
    > compatible layout.

    Yes, unfortunately it is still on by default.

    -hpa


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