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The only effect that free capacity has on performance is with regards to your paging, or "swap", file. Ideally, it should be between the same and ouble the amount of RAM you have installed on your computer. So if you have 2 GB of RAM, you'll want at least 2 GB free, although Windows may not need that much if you do nothing memory-intensive.

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15y ago
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11y ago

At least 10%. 20%-25% is optimal, but you'll get by okay with 10%. Do not let your total free space shrink beyond 10%.

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Q: How much free disk space do I need for optimum performance?
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For best performance and reliability you should always keep at least 10% of your hard disk space free.


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How can one see how much disk space is free on their hard drive in Microsoft Vista?

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