Having read this I think that having a modular add on HD-DVD drive was a rather clever move by M$. Having an internal Blue Ray drive is a fair (but small) risk for Sony whereas M$ can just license an add on Blue Ray drive for the 360 if HD-DVD loses. If Blue Ray were to fail for some reason then this would have a far greater impact on Sony (Streamed Media to the PS3 hard drive anyone?).
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