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Date: Thu, 10 Apr 2008 09:58:58 -0400 From: Bill Davidsen <davidsen@....com> To: Francis Moreau <francis.moro@...il.com> CC: linux-kernel@...r.kernel.org Subject: Re: Disk geometry from /sys Francis Moreau wrote: > Hi, > > I'm trying to know the geometry of my hard disk from a bash script > and that's the reason I'm looking in /sys. The reason is that I'd like > to figure out the size of a cylinder without doing a > ioctl(bdev, HDIO_GETGEO, &geo) > > Unfortunately I can't find anything useful and this is certainly a sign > that I'm doing something wrong. > > Or maybe can I simply assume from my script that the geometry > is always heads=255 and the number of sectors per track is 63 for all > disks. > > Looking at parted(8) source code, I can find this: > > /* The GETGEO ioctl is no longer useful (as of linux 2.6.x). We could > * still use it in 2.4.x, but this is contentious. Perhaps we should > * move to EDD. */ > > Could anybody give me some advices ? Given that the connection between any modern disk geometry and the assumption of a fixed number of sectors per track is pretty tenuous, I'm not sure any of the sizes, BIOS, boot program, or OS, are more than convention anymore. -- Bill Davidsen <davidsen@....com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot -- 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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