Hard drive
This magnetic disk provides you with space to save programs and files indefinitely--or at least for the life of the drive. Notebook hard drives can provide up to 120GB of storage, but these giant drives cost hundreds of dollars more than the default 60GB to 80GB notebook drives. The 60GB to 80GB drive should be sufficient, unless you store lots of music and movies or tons of pictures. Be warned that capacity alone does not make a good hard drive. The hard disk's rotational speed also makes a big difference; a 7,200rpm notebook disk delivers significantly faster performance than a 5,400rpm model. The faster the disk spins, the better your notebook will perform overall.