I am currently training TAI support computer technician and this drive box and indispenssable, ends the CD or DVD with an iso. I put a hard drive hitachi 7200 / min 500g 32mb cache. It allows all your iso demarer before the boot bones yours without problems, something that can not be an external hard drive Santard, it has a knob on the side to select the iso to launch. When commissioning an iso file created and after you can use the rest of the square standard storage :-) :-)
