From: Phillip Susi <psusi@cfl.rr.com>
To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Seewer Philippe <philippe.seewer@bfh.ch>,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: RFC: disk geometry via sysfs
Date: Thu, 16 Feb 2006 12:09:29 -0500 [thread overview]
Message-ID: <43F4B1C9.9070002@cfl.rr.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0602161125580.23082@chaos.analogic.com>
linux-os (Dick Johnson) wrote:
> I read it, and it's wrong. You don't bother to learn. I will
> take one last hack at this and then drop it.
>
> When a disk is first accessed, the BIOS reads the disk capacity.
> That's all. This disk capacity is in 512-byte things called "sectors".
>
You don't bother to mention HOW it is wrong, so it appears it is you who
fail to learn. I will attempt once more to explain. When you call int
13 and ask it for C = 3, H = 4, S = 5, exactly which sector you get
depends very much on what the bios thinks the geometry of the disk is,
because the bios will translate 3/4/5 into a completely different value
before sending it to the drive. That translation is dependent entirely
on which fake geometry the bios chooses to report the disk has.
I illustrated this translation and you simply say it is wrong. If that
is the case then show how.
next prev parent reply other threads:[~2006-02-16 17:10 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-10 13:06 RFC: disk geometry via sysfs Seewer Philippe
2006-02-13 9:56 ` Bartlomiej Zolnierkiewicz
2006-02-15 7:57 ` Seewer Philippe
2006-02-13 16:32 ` Phillip Susi
2006-02-13 19:02 ` Seewer Philippe
2006-02-13 19:22 ` linux-os (Dick Johnson)
2006-02-13 19:36 ` Phillip Susi
2006-02-14 16:35 ` Seewer Philippe
2006-02-13 19:34 ` Phillip Susi
[not found] ` <43F206E7.70601@bfh.ch>
2006-02-14 18:19 ` Phillip Susi
2006-02-15 8:39 ` Seewer Philippe
2006-02-15 8:51 ` Bartlomiej Zolnierkiewicz
2006-02-15 9:01 ` Seewer Philippe
2006-02-15 14:06 ` Alan Cox
2006-02-15 14:11 ` Seewer Philippe
2006-02-15 15:15 ` Alan Cox
2006-02-15 15:29 ` Phillip Susi
2006-02-16 8:12 ` Seewer Philippe
2006-02-16 15:36 ` Phillip Susi
2006-02-16 15:41 ` Seewer Philippe
2006-02-16 16:15 ` Phillip Susi
2006-02-15 15:20 ` Phillip Susi
2006-02-15 16:06 ` Alan Cox
2006-02-15 16:20 ` Phillip Susi
2006-02-15 17:32 ` Alan Cox
2006-02-15 18:43 ` Phillip Susi
2006-02-15 19:23 ` linux-os (Dick Johnson)
2006-02-15 20:54 ` Phillip Susi
2006-02-15 21:41 ` linux-os (Dick Johnson)
2006-02-15 22:43 ` Phillip Susi
2006-02-16 12:33 ` linux-os (Dick Johnson)
2006-02-16 15:26 ` Phillip Susi
2006-02-16 16:15 ` Seewer Philippe
2006-02-16 17:01 ` Phillip Susi
2006-02-16 16:39 ` linux-os (Dick Johnson)
2006-02-16 17:09 ` Phillip Susi [this message]
2006-02-16 19:01 ` linux-os (Dick Johnson)
2006-02-16 19:55 ` Phillip Susi
2006-02-16 8:18 ` Seewer Philippe
2006-02-16 18:14 ` Matt Domsch
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