Editor's note (1/12/10): For more-current advice, see "How (and Why) to Partition Your Hard Drive."
No matter the capacity of your PC's hard drive, chances are that it's set up to function as one giant data dump. Though that's fine for most users, dividing your drive into multiple partitions (additional drive letters) can make life easier: At the least, keeping all your data--such as documents, worksheets, and images--in a partition separate from the operating system and applications simplifies backups and can increase your PC's performance.
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