Problem booting from pfsense 1.2.3 cd image

[drordby]

iv'w just download the last version of PFSENSE from the mirror link in the download section : http://www.pfsense.org/mirror.php?section=downloads  - which pfsense site recomend for. then i burn couple of image's such as: pfSense-1.2.3-RELEASE-1g-nanobsd.img.gz  - with my cd/rom but it wont boot ! i try several image version's and several burning software on 3 diffrent computers and nothing seem to boot from cd !  what am i missing ?
my question are:

1. do i need to do something before the burn to cd ? should i convert the file ? or change something ?
   2)what are the diffrents version at the site ?1g ? 2g ? 4g ?
   thanks a lot

[Cry Havok]

You need a .ISO to burn to CD.  Those are raw disk images, not CD images.

As for (2), that was answered here just the other day.

[drordby]

thanks for your reply . but i gut something i cant understand:

1. why they put on the download part an "raw disk images" what am i suppose to do with them ? convert them to ISO image ?
2. wherer can i get an allready made ISO image for installation ?
   unfortuntely the "raw disk images" can't use for burn and install thing..  (why they put them there anyway..? )
   thanks again

[Cry Havok]

The installation documentation covers what they are and how you use them.

Following the link you posted lists 4 different NanoBSD images and an ISO.  If the mirror you selected doesn't list the ISO then post details so that it can be fixed and try another mirror.