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I would like to know how to change the performance index of the hard disk and why it remains at 5.9.

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The performance index of the disk is based on its mechanical (eg: rotation speed) and electronic design (eg: cache size) and although you may be able to make some minor adjustments to its operating parameters using manufacturer-supplied tools (if available), you're stuck with what you have and the only way to improve your disk performance index would be to obtain a higher-spec disk.

Edit: Just discovered that the highest possible rating for a mechanical disk under Windows 7 is 5.9 anyway - 6 and above are reserved for SSDs:

http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/increasing-windows-experience-rating-for-hard/6379c463-715f-4a2e-9f4c-2943ab94e1e9

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+1 Good Link, but if you read the link it links to it doesn't specifically check for SSDs, just for a high Random I/O rate (which will usually mean SSD). –  Lance Roberts Jul 10 '11 at 8:40
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  • Faster Interface
  • Faster Hard Drive
  • Faster Motherboard
  • Faster Bios
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