Date: Sun, 12 Jun 2005 14:48:43 -0700 From: "D. Goss" <lists@dylangoss.com> To: FreeBSD questions <freebsd-questions@freebsd.org> Cc: Wojciech Puchar <wojtek@tensor.3miasto.net>, Jerry McAllister <jerrymc@clunix.cl.msu.edu>, =?ISO-8859-1?Q?Bj=F6rn_K=F6nig?= <bkoenig@cs.tu-berlin.de> Subject: Re: 36.4GB drive formats out to 32.8GB? what am I missing please grep sectors /var/run/dmesg.boot Message-ID: <1122F428-95E6-4680-AB38-86A5A5B0F91A@dylangoss.com>
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> 36.4pseudomarketblahgigabytes=36400000000 bytes > > 1 real gigabyte is 2^30=1073741824 bytes and that's means your disk > has 33.9 real Gigabytes. > > rest are what's used up by inodes and bitmaps. > Thank you Wojciech - this is clear for me now. > please show the output of > > grep sectors /var/run/dmesg.boot da2: 34715MB (71096320 512 byte sectors: 255H 63S/T 4425C) da0: 17357MB (35548320 512 byte sectors: 255H 63S/T 2212C) da1: 34715MB (71096640 512 byte sectors: 255H 63S/T 4425C) The IBM drives I'm playing with are da1 and da2. Soon they will be part of a RAID-5 array with four of these. da0 will go away as it's U160/7200RPM and newer driver on bus are U320/15kRPM. > In addition to that filesystem building, manufacturer's "formatted" > capacity > is given in decimal so a Gigabyte... > Then the system, by default reserves 8% of the filesystem for > system overfill. Thanks Jerry also for the explanation. d.
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