Apple has always used SSDs that came in powers of 2. So what's the deal with 768? I think for a 256GB SSD, you'd have 16 16GB chips and for a 512GB SSD, you'd have 16 32GB chips. So how do you make a 768GB SSD, 8 32GB chips and 8 64 GB chips? What would then prevent you from making a 1TB SSD?