Sorry but you're wrong, they are not always the same size. If you read my post, I stated that I had THIS drive in THIS post WD1002FAEX and they sent me a brand new WD1502FAEX as a warranty replacement. So you're definitely wrong.
I'd say you're the rare exception to the rule then. I've done dozens of RMA's to WD (at work and personal) and never gotten a different size, but I do get an assortment of ones from malaysia or thailand and different firmware and slight hardware revisions.
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