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Message-ID: <20080409225207.732faa4e@core> Date: Wed, 9 Apr 2008 22:52:07 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: lsorense@...lub.uwaterloo.ca (Lennart Sorensen) Cc: Francis Moreau <francis.moro@...il.com>, linux-kernel@...r.kernel.org Subject: Re: Disk geometry from /sys > Why do you want to know what cylinder size the hard disk pretents to > have? What use could it be? Harddisks have varying numbers of sectors It matters on a CHS addressed device - vaguely. > drive. All that matters on a modern drive is the total number of > sectors since all access is done by requesting a specific sector number > starting from the begining of the drive. Where it is physically located > is none of software's business, and it may not even be adjacent to the > sector with a number right next to the requested one due to defect > management and various optimizations. And some other OS's make certain assumptions about layout that must agree with that OS view of the disk. A good general rule is to believe the partition table information if present and if not use SG_IO to issue an IDENTIFY to any ATA or CFA drive to see how it has mapped the device. Even better make use fo the existing tools whenever possible - disk partitioning is more like magic than science Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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