Date: Mon, 6 Dec 2004 02:03:08 -0800 From: "Alex Teslik" <alex@acatysmoof.com> To: "List freebsd-questions" <freebsd-questions@freebsd.org> Subject: 300Gb hard drive formatting to 249Gb - boo. Message-ID: <20041206095017.M3602@acatysmoof.com>
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Hello, I have recently installed a new 300Gb Maxtor hard disk: [root]/home/alex# dmesg -a | grep ^ad1 ad1: 286188MB <Maxtor 6B300R0> [581463/16/63] at ata0-slave UDMA100 This disk has a single partition on it and is formatted in compatibility mode: [root]/home/alex# disklabel ad1 # /dev/ad1c: type: ESDI disk: ad1s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 36482 sectors/unit: 586099332 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] c: 586099332 0 unused 0 0 # (Cyl. 0 - 36482*) e: 586099332 0 4.2BSD 1024 8192 22 # (Cyl. 0 - 36482*) now, I understand that a Gigabyte to the Maxtor corporation is 300,000,000,000 bytes. So, I would expect this disk to format to 279Gb based on the following math: [alex]/home/alex# bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. (((300000000000 / 1024) /1024) /1024) 279 However, when I mount the drive it is formatted to 271Gb, 8Gb less than what I expected. This wouldn't be so bad except that the available space on the drive is only 249Gb. :( Is this right? I feel like I am missing something. Can someone help me understand this better? I would love to regain the 30Gb I feel I am missing if possible. [root]/home/alex# mount /dev/ad1s1e /1 [root]/home/alex# df -h Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 97M 62M 27M 70% / /dev/da0s1e 7.7G 6.2G 938M 87% /usr /dev/ad0s1e 72G 66G 817M 99% /home procfs 4.0K 4.0K 0B 100% /proc /dev/ad1s1e 271G 1.0K 249G 0% /1 [root]/home/alex# df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/da0s1a 99183 63614 27635 70% / /dev/da0s1e 8084746 6477062 960905 87% /usr /dev/ad0s1e 75744027 68847899 836606 99% /home procfs 4 4 0 100% /proc /dev/ad1s1e 284046628 1 261322897 0% /1 I formatted this drive using the automatic settings in /stand/sysinstall->Index->Partitions. Thanks, Alex
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