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1:40 minutes? Nope don't think so... 40x writers are just a few seconds faster than 32x writers (which need about 3:50 minutes to write 700MB). The differences are even smaller when writing 650MB discs...
This is because these writers use Zone-Constant Linear Velocity (Z-CLV) to write discs: the disc is devided into 3 or 4 area's, e.g: 20x/24x/32x/40x so the average writing speed is far below 40x.
The Yamaha writers use a different method and to my knowledge they're the fastest.