RE: 200gb hard drive?

From: Derrick Ryalls (ryallsd_at_datasphereweb.com)
Date: 11/20/03

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    To: "'Omer Faruk Sen'" <freebsd@faruk.net>, <freebsd-questions@freebsd.org>
Date: Thu, 20 Nov 2003 12:56:45 -0800

    > I have installed a new hard drive to my FreeBSD system. Hard
    > drive is 200gb
    > but
    > when I fdisk and disklabel the output of "df -h" is something
    > like that:
    >
    > /dev/ad1s1e 183G 2.0K 169G 0% /disk2
    >
    > Here as you can see I can only use 169GB of it. Bios has seen
    > my harddrive
    > as 190GB also dmesg output is like that:
    >
    > ad1: 190782MB <WDC WD2000JB-00DUA3> [387621/16/63] at
    > ata0-slave UDMA100
    >
    > My question is what happened to 190-169 gb or maybe after
    > some filesystem
    > information reservation what happened to 183-169 gb?
    >
    > By the way I have used default newfs parameters -b 16384 -f
    > 2048. I don't
    > know if that helps...
    >

    When manufacturers talk about drive size, they use base 10. When computer
    report drive size, they use base 2. So, if you divide 200,000,000 bytes by
    ( 1024 * 1024 ), you get roughly 190gig in binary, so off the bat you lose
    10gigs of space due to marketspeak translation.

    FreeBSD reserves 8% for something (I forget what), so that brings it down to
    174gig. As for the last 5gig, dunno, sorry.

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