hi,
 
http://plan9.bell-labs.com/wiki/plan9/installation_instructions/index.html
 

>The installer on the CD assumes that your CD-ROM is on the second IDE master. If your CD->ROM is elsewhere, you will see the following error:

>Unknown boot device: sdD0!cdboot!9pcflop.gz
>Boot device: fd0
>boot from:

>IDE/ATAPI drives in Plan 9 are named like sdD0, where the capital letter is C for the primary IDE >interface and D for the second. The digit is 0 for the master and 1 for the slave. So if your CD->ROM is the primary slave, use sdC1:

>boot from: sdC1!cdboot!9pcflop.gz
i think this should help. You need to explicitly specify the cdrom drive you are using
hope it helps!
sameer

On 12/21/07, codewarrior85 <pcrkishan@gmail.com > wrote:
Hi All,

Am new to Plan 9. I burned the iso in a CD & tried to do a live Boot
from the CD in one of my old laptop( P2  233Mhz 32MB RAM )....I got
the boot screen ...I got the option screen & selected the option
( 2 ).....to run it in live demo mode....After i selected the
option .....some thing came like.....Boot from fd0....I was not able
to proceed further.........It jus kept asking me enter some value....
Som one plz help me.......

Thanx