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The same holds true for your modem connection. If you don't have a cable to get you from your computer to the phone jack, you're not going to link to the internet.
6: Disposable Cleansing Cloths.
Over time, the display on your notebook is going to get dusty, or even grimey. You're diceing with the death of your laptop if you attempt to clean your display with paper towels and spray cleaners.
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Capacity-wise, they're relatively small - usually well under 100 MB. However, they're very useful for moving files quickly and easily from one computer to another, e.g., moving a PowerPoint presentation from your laptop to your business associate's laptop.
A USB drive also makes a great temporary backup medium for the really important files you create on the road.
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8: Blank CD-R Discs.
You've just finished your big sales presentation. Someone from the audience approaches you afterward and asks for a copy of the presentation.