My Sony CD-RW/DVD-ROM has a speed of 52x/32x/52x/16x, but to access that I am forced to press and hold the single Disk Eject button for 10 seconds or so.
Until I do that the drive is effectively 40x/32x/40x/8x!
Imagine my surprise. And on top of that simply delightful function, I even got farked out of the $20 mail-in rebate....:(
Other than that, though, I have had no problems with this drive, reading or writing in any supported format.
Perhaps some digging online or in your drive's manual will tell you if your drive has a similar 'function'.