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    SubjectRe: ATA support for 4k sector size
    On Wed, Feb 25, 2009 at 09:50:43PM -0500, Theodore Tso wrote:
    > On Wed, Feb 25, 2009 at 06:27:18PM -0500, Martin K. Petersen wrote:
    > > Because of 63-sector legacy problems a bunch of ATA vendors will
    > > initially ship 512/4096 drives that are not naturally aligned.
    > > I.e. logical sector 63 will be aligned on a 4KB hardware sector
    > > boundary to overcome the misaligned default partitioning.
    >
    > Are we *sure* that this is what they plan to be doing? Is there a way
    > we can query the hardware to find out for sure what drives are doing
    > what?

    The drive I have that's pretending to be a 512/4k drive reports this:

    $ sudo sg_readcap -l /dev/sdc
    Read Capacity results:
    Protection: prot_en=0, p_type=0
    Last logical block address=625142447 (0x2542eaaf), Number of logical blocks=625142448
    Logical block length=512 bytes
    Logical blocks per physical block=3 (log base 2) [actual=8]
    Lowest aligned logical block address=0
    Hence:
    Device size: 320072933376 bytes, 305245.3 MiB, 320.07 GB

    This disagrees with Martin's assertion.

    --
    Matthew Wilcox Intel Open Source Technology Centre
    "Bill, look, we understand that you're interested in selling us this
    operating system, but compare it to ours. We can't possibly take such
    a retrograde step."


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