BT5 R2 in Persitant USB boot error

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http://www.backtrack-linux.org – Hi, after several trials I finally achieved to install BT5 R2 in a persistant USB using the Universal USB Linux installer (very similar to Unetbootin that gave me some problems) and the BT5 KDE 32bit ISO It now seems to work OK, but it has a very slow booting process. Taking out the splash screen I found several error messages that I'm not able to understand reason for them: a.- stdin: error 0 /init: line 3: can't open /dev sr0. No medium found Warning: Unable to find the persistent home medium Questions: Why is it looking for device sr0? (USB device is sda). Later on, there (HowTos)