From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Alexander Clausen <alex@gc-web.de>
Cc: linux-ide@vger.kernel.org
Subject: Re: 4k sector size and WD20EARS
Date: Thu, 08 Apr 2010 12:02:37 -0400 [thread overview]
Message-ID: <yq17hoix78i.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <4BBDE620.3040601@gc-web.de> (Alexander Clausen's message of "Thu, 08 Apr 2010 16:20:16 +0200")
>>>>> "Alexander" == Alexander Clausen <alex@gc-web.de> writes:
Alexander> Hi, i just bought some WD20EARS harddisk. They are supposed
Alexander> to have 4k physical sector size, right? My system seems to
Alexander> think they are not:
Alexander> alex@hal:/sys/block/sdb/queue$ cat logical_block_size
Alexander> physical_block_size 512 512
Alexander> so, who is right?
For unknown reasons these drive report themselves as 512-byte drives
despite using 4096-byte sectors internally.
There really isn't much we can do about devices that don't tell us the
truth. However, recent fdisk/parted will align on a 1MB boundary by
default which happens do the trick in this particular case (because the
WDC drive is naturally aligned).
Alexander> 1 Primary 0 3907024064 63 3907024065 Linux (83) None
Alexander> alex@hal:~$
Alexander> is that okay for 4k sector size?
No, you should shift the start sector using the fdisk's advanced menu.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2010-04-08 16:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-08 14:20 4k sector size and WD20EARS Alexander Clausen
2010-04-08 16:02 ` Martin K. Petersen [this message]
2010-04-08 16:12 ` Mikael Abrahamsson
2010-04-08 16:33 ` Martin K. Petersen
2010-04-08 17:00 ` Mikael Abrahamsson
2010-04-08 18:56 ` Martin K. Petersen
2010-04-08 17:04 ` Alexander Clausen
2010-04-09 2:14 ` Martin K. Petersen
2010-04-12 12:34 ` Karel Zak
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=yq17hoix78i.fsf@sermon.lab.mkp.net \
--to=martin.petersen@oracle.com \
--cc=alex@gc-web.de \
--cc=linux-ide@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.