Questions about hard drives, optical drives, USB drives, and flash memory

Hardware Software Storage Displays Laptops Internet The Web E-mail General		Storage Questions: What is the difference between "recover" and "restore?" Can I use my internal hard drive as an external hard drive? Will adding more RAM give my computer more free space? Can I transfer a program like Print Shop that is on many CDs to a single DVD? What is the difference between a USB hard drive and a USB flash drive? How can I free up space on my hard disk? How do I open files from a USB flash drive? How can I make sure everything is deleted off my hard drive before I sell my computer? How do I know if the blank CDs & DVDs I buy are rewritable? Is it possible to recover files off a disk that has been reformatted or initialized? What does it mean to reformat a hard drive? What is a lost cluster? What does it mean to defragment a hard disk? Are Zip disks more reliable than 3.5" diskettes (floppy disks)? Why does my hard drive make a lot of noise? Why does my hard drive spit and shutter so much even after I defragmented it? What would I want to partition my hard drive? Can I still start my computer if my hard drive fails? Why won't my new IDE hard drive work after I just installed it? What is the difference between a double density (DD) diskette, and a high density (HD) diskette?