This is due to a common misconception. "4X, 8X," etc. in CD drive specs refer to the data transfer rate of a drive that is spinning at the same speed as a Red Book CD (this is because CD-ROMs are an offshoot of CD-Audio technology). It does not refer to "clock on the wall" time. If you're burning high-resolution files to a CD24, they take longer; for example, a 1-minute standard 16/44.1 file will burn in about 15 seconds, but a 1-minute long 16/88.2 file will take about 30 seconds to burn. The rate of data transfer in each case is in fact 4X, but the larger amount of data will make the second burn appear slower by the counter. For a more detailed explanation of this, please refer to the Owner’s Manual section on "Creating a CD".