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I Googled my HDD model number, and could only find the physical dimensions and the data transfer rate. Where can I find the HDD cache/buffer size?

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Could you tell us the HDD model and number? – Simon Sheehan Sep 1 '11 at 13:25
googling a bit more would give you the cache size – woliveirajr Sep 1 '11 at 15:57
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I couldn't find the spec for cache either, even on their product website...

But you can use HD Tune Pro to find out. In the [Info] section, there is a cache size. It's not a free software, but it has free-trial, which should be enough in this case. The newest version also contains a cache test.

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Actually your true transfer rate will depends on the system that you are running it. For example, if your USB controler isn't too fast, your external hard disk will not reach its nominal transfer rate.

I search for my HDD buffer size with Windows msinfo32 (type "msinfo32" on a cmd prompt) and on SIW software but I didn't find this specific information, However, I hope all of these specifications you will get on manufacturer datasheets, for Western Digital, you will find here (just search for your model part number). If you want to test the trully transfer rate of your external device, I would recommend you using HD Tune or HD Tach. Both are benchmark programs and will shows you detailed information about your device capabilities(SMART) and real rates.

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This is good factual information that is probably relevant to OP's concerns, so I don't want to downvote it, but I don't see how on earth this answers the question of "How do I find the cache/buffer size?" – Shinrai Sep 1 '11 at 13:55
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