The Intel 520 is not a HDD, it's a SSD.
It's not the fastest 120GB SSD, but Intel SSDs are among the most reliable.
You probably wouldn't notice any real-world difference between the Intel and other 120GB drive that's faster.
 

WINTERLORD

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Sep 20, 2008
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well 70% of the time i use my pc for heavy multi tasking and applications. sometimes i record movies and such to. id assume since reads are plent fast for multi taskin apps and such that id want a good write and incompressable data speed