I got this email from a reader over the weekend, and thought it could be of value to readers. She asks: "My defrag window says 3 items, C: and E: backup and system (no letter). Which should I defrag and how often?"
It's something many folks wonder about. This was my response:
"You want to defragment your C: drive. If you're a normal user of a computer (meaning you use it for Internet stuff, email and the like), a once-per-month defrag should be fine. If you're a heavy user, meaning you use it eight hours per day for work, you should back it up more often, probably once every two weeks. Anytime your disk is more than 10% fragmented, you should defragment it.
Also, if your computer is running slow, you should consider doing a defrag; the fragmentation may be causing the slowdown. Here's a step-by-step guide for doing a defrag. Here's a guide for defrag under Windows 7."
Defrag is short for "defragment", and it means to put your computer files back in a logical order, speeding up your PC. Over time, files can be scattered all over your hard drive, and it's much harder to find everything.