Is the PDCA Cycle important? How do you use it how?

A close friend of yours has just invested in a shiny new PC. She claims the new system is three times as quick as the previous one because of its 1GHz clock speed. What one thing would you most want to tell her if you had the chance? (Here, think about how Amdahl's Law applies.)

Explain the organizational differences between a magnetic disc and an SSD.I don't see the connection between a disc and them.

Today ECC is fast replacing RSA algorithm. What are the advantages and disadvantages of ECC over RSA? Give at least five points of comparison.