I downloaded and burned to dvd bt5 r3 32bit gnome for a specific task..problem is the dvd boots up well and display the option screen with various choices i.e

back track text(default)
back track stealth
back track forensics. e.t.c

i chose the default option"Backtrack text - default boot text mode"

unfortunately i'm not taken to the next level of installation as provided by official instruction instead i get long sequence of data lines with an error message at the bottom and end of the page

"unable to mount root fs on unknown block (2.0)"

someone please help resolve this issue