True, the computer will read from, say, a blu-ray and then transfer it to your RAM to before writing it to your hard drive and then, through the various other wonders of computers, it can be displayed on your monitor.
d- enjoy
b- national service !
There might be insufficient storage space so your computer usually takes a longer time to load.The bigger your file, the longer it takes to load. So the solution is to clear up your storage space