From: "Martin Schwidefsky" <schwidefsky@de.ibm.com>
To: Andries Brouwer <aebr@win.tue.nl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: hd_geometry question.
Date: Tue, 2 Jul 2002 11:16:06 +0200 [thread overview]
Message-ID: <OF25B15FAC.FE67359D-ONC1256BEA.0032B6AA@de.ibm.com> (raw)
>About a partition one wants to know start and length.
>About a full disk one wants to know size, and perhaps a (fake) geometry.
>
>The vital partition data cannot depend on obscure hardware info.
>So, the units used must be well-known. Earlier, everything was in
>512-byte sectors, but there are a few places where that is inconvenient
>or unnatural, and now that one has more than 2^32 sectors and 64 bits
>are needed anyway, things are measured in bytes.
>
>That the start field comes with the HDIO_GETGEO ioctl and the size with
>the BLKGETSIZE ioctl is due to history. Both are given in 512-byte sectors.
>BLKGETSIZE64 gives bytes.
Just to make sure I got that right, HDIO_GETGEO delivers a FAKE geometry
based on the assumption that the sector size is 512 bytes ?
blue skies,
Martin
next reply other threads:[~2002-07-02 9:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-02 9:16 Martin Schwidefsky [this message]
2002-07-02 10:50 ` jw schultz
2002-07-03 0:20 ` Andries Brouwer
2002-07-03 23:48 ` Roman Zippel
2002-07-04 9:09 ` Andries Brouwer
2002-07-04 22:15 ` Andre Hedrick
2002-07-08 18:55 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2002-07-03 8:13 Martin Schwidefsky
2002-07-03 9:37 ` Andries Brouwer
2002-07-01 16:02 Martin Schwidefsky
2002-07-01 19:19 ` Andre Hedrick
2002-07-01 19:58 ` Andries Brouwer
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