Oracle 11g production database copy to USB drive
To get a consistent single-file snapshot of a running Oracle instance DataPump Export can be used.

You need to have access to the server's filesystem (or a shared filesystem) in order to copy the resulting dump file.

The process would be to 


run expdp (for one or multiple schemas)
copy the dump file to the USB stick
run impdp to import the dump into the development database