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Let me ask you this, do you notice a 1800rpm difference in your engine? Essentially the same concept. Sure, 7200rpm is going to be faster.
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So. let me ask you this then, do you notice the difference between $2 and $8 in your wallet? hah, analogy again, but funny.
The cache is there basically for queuing purposes. The hdd holds info in the cache for very quick access (like, on demand). The more cache you have, the more efficient the process becomes. Most drives today I believe are coming with 8mb of cache on them. If it's coming with 8mb of cache, this is a good thing!