[lkml]   [2010]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: ATA 4 KiB sector issues.
On Mon, Mar 8, 2010 at 10:18 AM, Martin K. Petersen
<> wrote:
>>>>>> "Tejun" == Tejun Heo <> writes:
> Tejun> The [Windows Vista/7] partitioner seems to be using 1M as the
> Tejun> basic alignment unit and offsetting from there if explicitly
> Tejun> requested by the drive
> Yep.
> Tejun> Please note that hdparm is misreporting the alignment offset.  It
> Tejun> should be reporting 512 instead of 256 for offset-by-one drives.
> Already fixed.  Your hdparm must be old.
> 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?
> 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.
> Tejun> (need more details and probably a whole section on partitioner
> Tejun> behaviors)
> I'm Cc:'ing Karel Zak and Jim Meyering who have been doing all the
> alignment work for fdisk and parted respectively.  Karel, Jim: The full
> writeup is here:
> It'd be great if you guys could share what you have been doing to the
> tooling.

I've been keeping track of all the pieces in play, have coordinated
with kzak and jim, and have a summary that offers some amount of macro
detail (at the end I touch on parted and fdisk):
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2010-03-08 20:37    [W:0.321 / U:7.600 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site