I have a WD My Book Essential 2.0 500GB and I'm wondering if it's possible to buy a larger WD disk and put it in the same enclosure? Would there be any noticeable difference in speed between 32 and 16 MB cache through USB 2.0? I'm asking because there is a WD Studio Edition 1TB (16 MB) which is ~10 more expensive compared to the WD GreenPower 1TB (32 MB) I want to buy.
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