200gb hard drive?

Derrick Ryalls ryallsd at datasphereweb.com
Thu Nov 20 12:56:50 PST 2003

> 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.

More information about the freebsd-questions mailing list