Date: Thu, 21 Jan 2010 12:36:36 +0100 From: Dimitry Andric <dimitry@andric.com> To: Ivan Borodin <noamscai.ml@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Manual partitioning for newbies Message-ID: <4B583C44.5060107@andric.com> In-Reply-To: <4c44ea791001210130j75e220b2p7ffd5731d940aa1@mail.gmail.com> References: <4c44ea791001210130j75e220b2p7ffd5731d940aa1@mail.gmail.com>
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On 2010-01-21 10:30, Ivan Borodin wrote: > Excuse me, haven't found a mailing list for newbies... That would be freebsd-questions@, AFAIK. > [root@ ~]# fdisk -s /dev/ad5 > /dev/ad5: 19383 cyl 16 hd 63 sec > Part Start Size Type Flags > 1: 63 19538001 0xa5 0x80 > > [root@ ~]# atacontrol cap ad5 | grep lba > lba supported 19538975 sectors > lba48 not supported > > Seems like sysinstall threw away 974 sectors while partitioning.. This is because partitions are aligned to cylinders by default. In your case, the disk says it has 19383 cylinders, 16 heads and 63 sectors per track, so that is 19538064 sectors total. In some cases, disks advertise more LBA sectors than they would seem to have if you calculate cyl * hd * sec. This is because the 'geometry' is entirely fake, and sometimes doesn't fit the real number of available sectors. So in your case, there are 911 sectors slack space at the end. Not the end of the world. :) Btw, if 'dangerously dedicated' partitions are still supported in your version of sysinstall, you might be able to use the whole LBA capacity for your slices.
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