Hi denali. I'm guessing here, but other makes of CD-ROM drives have an option implemented in one way or another whereby the drive normally runs at a lower speed, usually 48x, unless a button is pressed, or held in, when the drive will run at 52x. The reason for this is that at 52x vibration is much worse, and the disk is spinning very nearly at a speed at which the plastic can no longer hold itself together, with a serious risk of the disk shattering. Considering that at 48x a full disk will be read in about 75 seconds, and at 52x it will be read in about 69 seconds, it really isn't worth the risk involved in saving the last 6 seconds. I think the 52x option is only put there for reasons of specmanship.