Date: Sun, 31 May 1998 16:54:17 -800 From: walton@nordicdms.com (Dave Walton) To: Greg Lehey <grog@lemis.com>, freebsd-questions@FreeBSD.ORG Subject: Re: fdisk slice oddities Message-ID: <19980531235417422.AAA277@mail.nordicdms.com> In-Reply-To: <19980530185741.K20360@freebie.lemis.com> References: <19980530073409264.AAA277@mail.nordicdms.com>; from Dave Walton on Sat, May 30, 1998 at 12:34:09AM %2B0000
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On 30 May 98 at 18:57, Greg Lehey wrote: > Dedicated mode. It's not only not dangerous, it's safer than > non-dedicated mode. Really? Why is it safer? Sysinstall calls it "dangerously dedicated", BTW. > > Is there some particular reason why dangerously dedicated mode > > changes the drive geometry? > > It might come closer to getting it right. That's just it... It's not changing to a more correct geometry, it's changing to a geometry with < 1024 cylinders. For example, on this 6.5GB drive that I'm working with right now, dmesg and fdisk report the geometry as 13328/15/63. If I use the whole disk in "dedicated mode", the geometry changes to 784/255/63. > I suppose the most important difference is that no modern disks have a > rigid geometry any more (in other words, the terms cylinders, heads > and sectors are all faked). All we care about is the LBA (logical > block addressing) mode. Which is why I'm surprised that fdisk changes to something other than LBA mode for "dedicated mode". > Apart from the observation, did you have any problems? No, it just strikes me as a peculiar behavior, so I thought I'd mention it. By the way, given the choice between an LBA geometry and a <1024 geometry, is there any particular reason to go with one over the other? Thanks, Dave ---------------------------------------------------------------------- Dave Walton Webmaster, Postmaster Nordic Entertainment Worldwide walton@nordicdms.com http://www.nordicdms.com ---------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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