Installing on large disk

Derek Ragona derek at
Mon Mar 26 16:49:39 UTC 2007

The 1023 cylinder limit is BIOS limit for booting.  If your BIOS is more 
modern it will support booting from translated cylinder addresses > 
1023.  The easiest way to tell is to try updating your BIOS, and trying the 

With older hardware I would have to have boot partitions all located at < 
1023 cylinders so you'd have the / partition and a windows c: drive both < 
1023 on a dual boot system.  This limit has mostly disappeared with more 
modern BIOS that will address and boot drives at > 1023.


At 03:50 PM 3/25/2007, John C Nolen wrote:
>I have a 40 GB hard disk that was made in 2001 with windows xp installed 
>on a 20 GB partition. BIOS setup says 19158 cylinders, 16 heads and 255 
>I want to install freeBSD on the second 20 GB partition. All the 
>instructions seem to refer to small disks, as they appear to require 
>cylinders less than 1023.
>Sysinstall appears to require cylinders less than 1023. Did I miss something?
>Is it possible to install BSD as a dual operating system with windows xp 
>on a disk larger than 8 GB ?
>Am I trying to do something impossible?
>Should I just ignore warnings and type in 1023 when asked about cylinders?
>If I uninstall the windows xp can I put freeBSD on one big 40GB partition?
>I could not find any information on this in handbook or FAQ.
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