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Date: Thu, 10 Apr 2008 21:23:32 +0200 From: "Francis Moreau" <francis.moro@...il.com> To: "Lennart Sorensen" <lsorense@...lub.uwaterloo.ca> Cc: linux-kernel@...r.kernel.org Subject: Re: Disk geometry from /sys Hello, On Wed, Apr 9, 2008 at 11:28 PM, Lennart Sorensen <lsorense@...lub.uwaterloo.ca> wrote: > Many compact flash cards will report 16 heads, and 16 or 32 sectors > per track. Compact flash can of course connect as an IDE drive, so they > are worth supporting (I keep trying to get the grub guys to accept my > patch to fix their code that also assumed all disks have 63 sectors per > track if they use LBA, but which is false since compact flash also > supports LBA even with smaller sizes). > Ok so assuming 255 heads seems not to be a good idea. > Simplest way to find out what geometry a disk pretents to have is to ask > fdisk, or to create a new entry in /sys: /sys/block/sda/geometry/heads ? > and since the only use for the information is when creating > partitions, then fdisk's opinion is really all that seems to matter. Of > course partitions can start and end anywhere so the total size is > actually all that really matters. > I'm not sure about that. Some bootloaders have constraint on the start and end of a partition. It assume they're aligned on a cylinder size boundary. I got this warning from sfdisk(8). Thanks -- Francis -- 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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