I had tried to run backtrack 5 r3 from usb and i faced this problem at the end of the black screen: "---[ end trace .... ]---
kernel panic - not syncing:attempted to kill init!
[sda] attached scsi disk" ,where backtrack freezes and wont response.
I tried to reinstall it,but nothing changed.
I have formatted usb to fat32 and have used unetbootin.