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Subject: bug#24448: Interpretation of partition entry sizes on "4kn" disks
Resent-From: Cris Perdue <cris.perdue@HIDDEN>
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From: Cris Perdue <cris.perdue@HIDDEN>
Date: Thu, 15 Sep 2016 13:54:37 -0700
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In partition tables, GPT entries specifically, there are 8 byte fields for
the first and last LBA of the partition. Traditionally logical blocks are
512 bytes, but some new disks report sector sizes of up to 4096 bytes as
both logical and physical sector size.  For these so-called 4kn disks,
should the partition table entries be interpreted as representing units of
4096 bytes, or does the magic number 512 still apply to their partition
table entries?

I have been having a hard time determining which would be the expected
interpretation.

Thanks much,
Cris

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<div dir=3D"ltr">In partition tables, GPT entries specifically, there are 8=
 byte fields for the first and last LBA of the partition. Traditionally log=
ical blocks are 512 bytes, but some new disks report sector sizes of up to =
4096 bytes as both logical and physical sector size.=C2=A0 For these so-cal=
led 4kn disks, should the partition table entries be interpreted as represe=
nting units of 4096 bytes, or does the magic number 512 still apply to thei=
r partition table entries?<div><br></div><div>I have been having a hard tim=
e determining which would be the expected interpretation.</div><div><br></d=
iv><div>Thanks much,</div><div>Cris</div><div><br></div></div>

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To: Cris Perdue <cris.perdue@HIDDEN>
Subject: bug#24448: Acknowledgement (Interpretation of partition entry
 sizes on "4kn" disks)
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Subject: bug#24448: Interpretation of partition entry sizes on "4kn" disks
Resent-From: "Brian C. Lane" <bcl@HIDDEN>
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To: Cris Perdue <cris.perdue@HIDDEN>
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Date: Mon, 19 Sep 2016 09:15:48 -0700
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On Thu, Sep 15, 2016 at 01:54:37PM -0700, Cris Perdue wrote:
> In partition tables, GPT entries specifically, there are 8 byte fields for
> the first and last LBA of the partition. Traditionally logical blocks are
> 512 bytes, but some new disks report sector sizes of up to 4096 bytes as
> both logical and physical sector size.  For these so-called 4kn disks,
> should the partition table entries be interpreted as representing units of
> 4096 bytes, or does the magic number 512 still apply to their partition
> table entries?

LBA always  refers to the drive's block size. So it may be 512 or 4096
or some other value, depending on what the drive reports.

-- 
Brian C. Lane | Port Orchard, WA (PST8PDT)

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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