From: Phillip Susi <psusi@ubuntu.com>
To: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Gene Heskett <gheskett@wdtv.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: 64 bit kernel won't mount /
Date: Sun, 25 Jan 2015 16:18:27 -0500 [thread overview]
Message-ID: <54C55DA3.4050400@ubuntu.com> (raw)
In-Reply-To: <20150122153458.6493d3fd@lxorguk.ukuu.org.uk>
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On 01/22/2015 10:34 AM, One Thousand Gnomes wrote:
> Unlikely. Apart from fdisk the setup is basically invisible. The
> drive reports a block size and an offset. The firmware offset is
> chosen so that the chassic DOS alignments in fdisk happen to just
> fall nicely on 4K boundaries for partition starts.
>
> There is nothing special the OS does to deal with ATA/SATA 4K
> sectors.
Incorrect: the kernel bogus/synthetic "geometry" is the maximum
allowed of 63 sectors per track, and the old dos default alignment for
the first partition on the disk places its start at sector 63, which
is not 4k aligned. The special thing that partitioning tools have to
do is to align the partition start to a 4k boundary. For several
years now, parted has defaulted to 1 MiB alignment, like Windows has
done, which gives a 4k alignment. I don't recall if Ubuntu 10.04 is
old enough to predate this change. You certainly do NOT want to use
the cylinder alignment option in gparted.
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next prev parent reply other threads:[~2015-01-25 21:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-19 16:45 64 bit kernel won't mount / Gene Heskett
2015-01-20 12:03 ` Gene Heskett
2015-01-21 17:23 ` One Thousand Gnomes
2015-01-21 19:21 ` Gene Heskett
2015-01-22 15:34 ` One Thousand Gnomes
2015-01-23 5:06 ` Gene Heskett
2015-01-25 21:18 ` Phillip Susi [this message]
2015-01-26 21:38 ` One Thousand Gnomes
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